2nd Edition (June, 1996)ps-2.kev009.com/ohlandl/8271/awad0001.pdfChapter 4. Configuring the 8271...

2nd Edition (June, 1996)

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Contents

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvWho Should Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . xvHow This Manual Is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvPrerequisite Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvRelated Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

Chapter 1. Physical Characteristics and Features of the IBM 8271 NwaysLAN Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

EIA 232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Service Information Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Ethernet Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5EtherProbe Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Universal Feature Card Slot and Cards . . . . . . . . . . . . . . . . . . . . . 1-6Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6System Request Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Status and Activity Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8Management and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Chapter 2. Network Planning and Installation Preparations . . . . . . . . . 2-1Preparations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Rules to Remember . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Cables and Distances between Devices . . . . . . . . . . . . . . . . . . . . . 2-1Interconnecting 8271s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Sample Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Filling Out the Planning Charts and Worksheets . . . . . . . . . . . . . . . . . . 2-5Planning for Configuration and Management . . . . . . . . . . . . . . . . . . . . 2-6

Filling Out the IBM 8271 Configuration Parameters Worksheet . . . . . . . . 2-7Filling Out the Locator Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Chapter 3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Installation Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Unpacking Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Gather the Other Materials You Will Need . . . . . . . . . . . . . . . . . . . . . 3-2Installing a Universal Feature Card . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Rack Mounting the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Surface Mounting the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Connecting Devices to the 10BASE-T Ports . . . . . . . . . . . . . . . . . . . 3-5Connecting Devices to the 10BASE-T Ports Using Building Wiring . . . . . 3-6Connecting to the AUI Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Powering On the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Copyright IBM Corp. 1996 iii

Chapter 4. Configuring the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Default Configuration Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Preparing to Configure the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Configuring Universal Feature Cards . . . . . . . . . . . . . . . . . . . . . . . 4-2Configuration Using the SNMP-Based Manager . . . . . . . . . . . . . . . . . . 4-3

Setting Up a Console Session . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Beginning the Console Session . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6Making and Saving Changes and Other Shortcuts . . . . . . . . . . . . . . . . 4-7Configuring the 8271 Using Console Panels . . . . . . . . . . . . . . . . . . . . 4-8

Viewing Switch Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10Configuring Virtual Switch Domains . . . . . . . . . . . . . . . . . . . . . . . 4-12Configuring Virtual Switch Ports . . . . . . . . . . . . . . . . . . . . . . . . . 4-13Naming Virtual Switch Domains . . . . . . . . . . . . . . . . . . . . . . . . . 4-15Selecting Virtual Switch Domains to Define Parameters . . . . . . . . . . . 4-16Configuring IP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17Configuring SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19Setting Community Strings Parameters . . . . . . . . . . . . . . . . . . . . 4-20Setting Trap Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21Configuring Spanning Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22Setting Port Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24Setting Port Path Cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26Viewing Current Spanning Tree Information . . . . . . . . . . . . . . . . . . 4-28Viewing Port Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30Viewing the Module Information Panel . . . . . . . . . . . . . . . . . . . . . 4-32Configuring EtherProbe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33EtherPipe Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34Configuring EtherPipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35Viewing the Running EtherPipe Information Panel . . . . . . . . . . . . . . 4-36Configuring the MAC Filter & Port Security . . . . . . . . . . . . . . . . . . 4-37Configuring MAC Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38Configuring Port Security Mode . . . . . . . . . . . . . . . . . . . . . . . . . 4-40Viewing Port Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42Configuring Address Aging . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43Viewing or Changing Port Address Table Aging . . . . . . . . . . . . . . . 4-44Viewing or Changing Master Address Table Aging . . . . . . . . . . . . . . 4-46Viewing or Changing Port Switching Mode . . . . . . . . . . . . . . . . . . 4-47Broadcast Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49Configuring and Changing the Password . . . . . . . . . . . . . . . . . . . 4-51Configuring the Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52Configuring Serial Link for the Console . . . . . . . . . . . . . . . . . . . . 4-53Configuring Telnet for a Console Session . . . . . . . . . . . . . . . . . . . 4-54Viewing or Closing Active Telnet Sessions . . . . . . . . . . . . . . . . . . 4-55

Resetting the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-55Reset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56

Chapter 5. Using the Statistics Panels . . . . . . . . . . . . . . . . . . . . . 5-1Viewing Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Viewing Switch Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2Viewing Port N Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4Viewing Address Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5Viewing the Master Address Table . . . . . . . . . . . . . . . . . . . . . . . . 5-6Viewing the Domain Address Table . . . . . . . . . . . . . . . . . . . . . . . . 5-7Viewing the Port N Address Table . . . . . . . . . . . . . . . . . . . . . . . . 5-8Viewing the Spanning Tree Bridge Information . . . . . . . . . . . . . . . . . 5-9

iv 8271 Nways EN LAN Switch Planning and Installation Guide

Viewing Current Spanning Tree Information . . . . . . . . . . . . . . . . . . 5-10Viewing Virtual Switch Statistics . . . . . . . . . . . . . . . . . . . . . . . . . 5-12Viewing IEEE 802.3 Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13Diagnostic Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13Message Log Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

Chapter 6. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Obtaining Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Troubleshooting in a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Start of Troubleshooting Process . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Understanding the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2Choosing a Troubleshooting Procedure . . . . . . . . . . . . . . . . . . . . . . . 6-3

Procedure A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3Procedure B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3Procedure C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4Procedure D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6Assembly 1: Final Assembly 8271 Model 108 . . . . . . . . . . . . . . . . . 6-6Assembly 2: Final Assembly 8271 Model 216 . . . . . . . . . . . . . . . . . 6-7Assembly 3: Line Cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Chapter 7. Downloading Software and BootP Information . . . . . . . . . 7-1Serial Port/TFTP Downloading with the Download Menu . . . . . . . . . . . . . 7-1Initiating a Download with the System Request Menu . . . . . . . . . . . . . . . 7-3BootP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

BootP Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4Editing the BootPTAB File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Appendix A. Planning Charts . . . . . . . . . . . . . . . . . . . . . . . . . . A-1IBM 8271 Configuration Parameters Worksheet . . . . . . . . . . . . . . . . . A-4

Switch Information Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4Virtual Switch Port Configuration Menu . . . . . . . . . . . . . . . . . . . . A-5Virtual Switch Name Configuration Menu . . . . . . . . . . . . . . . . . . . A-6IP Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7SNMP Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8Community Strings Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8Trap Receivers Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9Spanning Tree Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10Spanning Tree – Port Priority Menu . . . . . . . . . . . . . . . . . . . . . . A-11Spanning Tree – Port Path Cost Menu . . . . . . . . . . . . . . . . . . . . . A-11Port Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12EtherPipe Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13MAC Filter Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . A-14Port Security Mode Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-15Port Address Table Aging Menu . . . . . . . . . . . . . . . . . . . . . . . . A-16Master Address Table Aging Menu . . . . . . . . . . . . . . . . . . . . . . . A-17Port Switching Mode Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . A-18Password Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-19Console Serial Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . A-19Console Telnet Configuration Menu . . . . . . . . . . . . . . . . . . . . . . A-19

Appendix B. Cable and Pin Information . . . . . . . . . . . . . . . . . . . . B-1Connecting to the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Contents v

Connecting to the Management (EIA 232) Port . . . . . . . . . . . . . . . . . B-1Twisted-Pair Cable Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Straight-Through UTP Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2Crossover UTP Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2IBM STP Data Connector-to-RJ-45 Straight-Through Cable . . . . . . . . . B-3IBM STP Data Connector-to-RJ-45 Crossover Cable . . . . . . . . . . . . B-3

AUI Cable Pin-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3EIA 232 Port and Cable Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . . . B-4

EIA 232 Port Pin-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4EIA 232 Modem Cable Connections . . . . . . . . . . . . . . . . . . . . . . B-4EIA 232 Null-Modem Connections . . . . . . . . . . . . . . . . . . . . . . . B-4

Appendix C. Notices and Product Warranty . . . . . . . . . . . . . . . . . C-1Electronic Emission Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

European Community (CE) Mark of Conformity Statement for Unshielded C-2European Union (EU) Statement For Shielded Cable . . . . . . . . . . . . C-2Japanese Voluntary Control Council for Interference (VCCI) Statement . . C-3

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-9

vi 8271 Nways EN LAN Switch Planning and Installation Guide

Figures

1-1. The IBM 8271 Nways LAN Switch Model 108 and Model 216 . . . . . 1-11-2. Locations of LEDs, Switches, and Connectors for Model 108 . . . . . 1-41-3. Locations of LEDs, Switches, and Connectors for Model 216 . . . . . 1-42-1. Interconnected 8271s . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32-2. Typical Ethernet LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42-3. Adding the 8271 to a Typical Ethernet LAN . . . . . . . . . . . . . . . 2-42-4. Relieving Server Congestion . . . . . . . . . . . . . . . . . . . . . . . . 2-52-5. 8271 Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83-1. Removing the UFC Slot Cover . . . . . . . . . . . . . . . . . . . . . . . 3-23-2. Rack Mounting the 8271 . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43-3. Attaching the Mounting Brackets for Surface Mounting . . . . . . . . . 3-43-4. Connecting Devices to 10BASE-T Ports . . . . . . . . . . . . . . . . . 3-63-5. Connecting Devices to 10BASE-T Ports Using Building Wiring . . . . 3-73-6. Slide Latch on the AUI Port . . . . . . . . . . . . . . . . . . . . . . . . 3-83-7. Connecting an AUI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83-8. Pattern of the Status LEDs during Diagnostics . . . . . . . . . . . . . 3-94-1. Copyright Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64-2. Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-74-3. Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84-4. Switch Information Menu . . . . . . . . . . . . . . . . . . . . . . . . . 4-104-5. Virtual Switch Configuration Menu . . . . . . . . . . . . . . . . . . . . 4-124-6. Virtual Switch Port Configuration Panel (1 of 2) . . . . . . . . . . . . 4-134-7. Virtual Switch Port Configuration Panel (2 of 2) . . . . . . . . . . . . 4-144-8. Virtual Switch Name Configuration Panel . . . . . . . . . . . . . . . . 4-154-9. Virtual Switch Domain Selection Panel . . . . . . . . . . . . . . . . . 4-16

4-10. IP Configuration Panel . . . . . . . . . . . . . . . . . . . . . . . . . . 4-174-11. SNMP Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . 4-194-12. Community Strings Panel . . . . . . . . . . . . . . . . . . . . . . . . . 4-204-13. Trap Receivers Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-214-14. Spanning Tree Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-224-15. Port Priority Panel (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . 4-244-16. Port Priority Panel (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . 4-254-17. Port Path Cost Panel (1 of 2) . . . . . . . . . . . . . . . . . . . . . . 4-264-18. Port Path Cost Panel (2 of 2) . . . . . . . . . . . . . . . . . . . . . . 4-274-19. Current Spanning Tree Information Panel . . . . . . . . . . . . . . . 4-284-20. Port Configuration Panel (1 of 2) . . . . . . . . . . . . . . . . . . . . 4-304-21. Port Configuration Panel (2 of 2) . . . . . . . . . . . . . . . . . . . . 4-314-22. Module Information Menu . . . . . . . . . . . . . . . . . . . . . . . . . 4-324-23. EtherProbe Configuration Panel . . . . . . . . . . . . . . . . . . . . . 4-334-24. EtherPipe Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-344-25. EtherPipe Configuration Panel . . . . . . . . . . . . . . . . . . . . . . 4-354-26. Running EtherPipe Information Menu . . . . . . . . . . . . . . . . . . 4-364-27. MAC Filter & Port Security Menu . . . . . . . . . . . . . . . . . . . . 4-374-28. Filter Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . 4-384-29. Configure Port Security Mode (1 of 2) . . . . . . . . . . . . . . . . . 4-404-30. Configure Port Security Mode (2 of 2) . . . . . . . . . . . . . . . . . 4-414-31. View Port Filters Panel . . . . . . . . . . . . . . . . . . . . . . . . . . 4-424-32. Address Aging Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-434-33. Port Address Table Aging Panel (1 of 2) . . . . . . . . . . . . . . . . 4-444-34. Port Address Table Aging Panel (2 of 2) . . . . . . . . . . . . . . . . 4-45

Copyright IBM Corp. 1996 vii

4-35. Master Address Table Aging Panel . . . . . . . . . . . . . . . . . . . 4-464-36. Port Switching Mode Panel (1 of 2) . . . . . . . . . . . . . . . . . . . 4-474-37. Port Switching Mode Panel (2 of 2) . . . . . . . . . . . . . . . . . . . 4-484-38. Broadcast Suppression Panel (1 of 2) . . . . . . . . . . . . . . . . . 4-494-39. Broadcast Suppression Panel (2 of 2) . . . . . . . . . . . . . . . . . 4-504-40. Password Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-514-41. Console Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . 4-524-42. Serial Link Configuration Panel . . . . . . . . . . . . . . . . . . . . . 4-534-43. Telnet Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . 4-544-44. Telnet Sessions Panel . . . . . . . . . . . . . . . . . . . . . . . . . . 4-554-45. Reset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-564-46. Messages during Diagnostics . . . . . . . . . . . . . . . . . . . . . . 4-57

5-1. Statistics Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15-2. Switch Statistics Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-35-3. Port 1 Statistics Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45-4. Address Tables Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-55-5. Master Address Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-65-6. Domain Address Table . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-75-7. Port 1 Address Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-85-8. Spanning Tree Bridge Information Panel . . . . . . . . . . . . . . . . . 5-95-9. Current Spanning Tree Information Panel . . . . . . . . . . . . . . . 5-10

5-10. Virtual Switch Statistics Panel . . . . . . . . . . . . . . . . . . . . . . 5-125-11. IEEE 802.3 Statistics Panel . . . . . . . . . . . . . . . . . . . . . . . 5-13

7-1. Download Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17-2. TFTP Download Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27-3. System Request Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37-4. Example of a BootPTAB File . . . . . . . . . . . . . . . . . . . . . . . . 7-57-5. Example of a Master Address Table . . . . . . . . . . . . . . . . . . . 7-6B-1. Straight-Through Cable . . . . . . . . . . . . . . . . . . . . . . . . . . B-2B-2. Crossover UTP Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2B-3. IBM Cabling System Data Connector-to-RJ-45 Straight-Through

Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3B-4. IBM Cabling System Data Connector-to-RJ-45 Crossover Cable . . B-3B-5. Pin-Out of the AUI Cable . . . . . . . . . . . . . . . . . . . . . . . . . B-3B-6. Pin-Out of the EIA 232 Port . . . . . . . . . . . . . . . . . . . . . . . B-4B-7. EIA 232 Modem Cable . . . . . . . . . . . . . . . . . . . . . . . . . . B-4B-8. EIA 232 Null-Modem Cable for Terminal with 25-Pin Connector . . B-5B-9. EIA 232 Null Modem Cable for Terminal with 9-Pin Connector . . . B-5

Tables

1-1. Status LEDs and Their Meanings . . . . . . . . . . . . . . . . . . . . . 1-61-2. Port LEDs and Their Meanings . . . . . . . . . . . . . . . . . . . . . . 1-71-3. Port LEDs and Their Meanings . . . . . . . . . . . . . . . . . . . . . . 1-72-1. Typical Port Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63-1. 8271 Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . 3-13-2. Normal States of LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 3-104-1. MIBs Implemented in the 8271 SNMP Agent . . . . . . . . . . . . . . 4-36-1. 8271 Status LEDs and Their Meanings . . . . . . . . . . . . . . . . . . 6-26-2. Port LEDs and Their Meanings . . . . . . . . . . . . . . . . . . . . . . 6-2

viii 8271 Nways EN LAN Switch Planning and Installation Guide

6-3. Symptom, LED State, and Recommended Procedure . . . . . . . . . 6-3B-1. Typical Port Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1B-2. Connecting the 8271 to the EIA 232 Port . . . . . . . . . . . . . . . B-1

Tables ix

x 8271 Nways EN LAN Switch Planning and Installation Guide

Safety Information

Danger: Before you begin to install this product, read the safety informationin Caution: Safety Information—Read This First, SD21-0030. This bookletdescribes safe procedures for cabling and plugging in electrical equipment.

Varning — livsfara: Innan du börjar installera den här produkten bör duläsa säkerhetsinformationen i dokumentet Varning: Säkerhetsföreskrifter— Läsdetta först, SD21-0030. Där beskrivs hur du på ett säkert sätt ansluter elektriskutrustning.

Fare: Før du begynner å installere dette produktet, må du lesesikkerhetsinformasjonen i Advarsel: Sikkerhetsinformasjon — Les dette først,SD21-0030 som beskriver sikkerhetsrutinene for kabling og tilkobling av elektriskutstyr.

Fare! Før du installerer dette produkt, skal du læse sikkerhedsforskrifterne iNB: Sikkerhedsforskrifter—Læs dette først SD21-0030. Vejledningen beskriverden fremgangsmåde, du skal bruge ved tilslutning af kabler og udstyr.

Gevaar: Voordat u begint met de installatie van dit produkt, moet u eerst deveiligheidsinstructies lezen in de brochure PAS OP! Veiligheidsinstructies—Lees diteerst, SD21-0030. Hierin wordt beschreven hoe u electrische apparatuur op eenveilige manier moet bekabelen en aansluiten.

Gevaar Voordat u begint met het installeren van dit produkt, dient u eerstde veiligheidsrichtlijnen te lezen die zijn vermeld in de publikatie Caution: SafetyInformation - Read This First, SD21-0030. In dit boekje vindt u veilige proceduresvoor het aansluiten van elektrische appratuur.

Vorsicht: Bevor mit der Installation des Produktes begonnen wird, dieSicherheitshinweise in Achtung: Sicherheitsinformationen—Bitte zuerst lesen, IBMForm SD21-0030. Diese Veröffentlichung beschreibt die Sicherheitsvorkehrungenfür das Verkabeln und Anschlie8271en elektrischer Geräte.

Copyright IBM Corp. 1996 xi

Danger : Avant d'installer le présent produit, consultez le livret Attention :Informations pour la sécurité — Lisez-moi d'abord, SD21-0030, qui décrit lesprocédures à respecter pour effectuer les opérations de câblage et brancher leséquipements électriques en toute sécurité.

Danger: Avant de procéder à l'installation de ce produit, lisez d'abord lesconsignes de sécurité dans la brochure ATTENTION: Consignes de sécurité—Alire au préalable, SD21-0030. Cette brochure décrit les procédures pour câbler etconnecter les appareils électriques en toute sécurité.

Pericolo: prima di iniziare l'installazione di questo prodotto, leggere leinformazioni relative alla sicurezza riportate nell'opuscolo Attenzione: Informazionidi sicurezza — Prime informazioni da leggere in cui sono descritte le procedure peril cablaggio ed il collegamento di apparecchiature elettriche.

Perigo: Antes de iniciar a instalação deste produto, leia as informações desegurança Cuidado: Informações de Segurança — Leia Primeiro, SD21-0030.Este documento descreve como efectuar, de um modo seguro, as ligaçõeseléctricas dos equipamentos.

Peligro: Antes de empezar a instalar este producto, lea la información deseguridad en Atención: Información de Seguridad — Lea Esto Primero, SD21-0030.Este documento describe los procedimientos de seguridad para cablear y enchufarequipos eléctricos.

Perigo: Antes de começar a instalar este produto, leia as informações desegurança contidas em Cuidado: Informações Sobre Segurança—Leia IstoPrimeiro, SD21-0030. Esse folheto descreve procedimentos de segurança para ainstalação de cabos e conexões em equipamentos elétricos.

VAARA: Ennen kuin aloitat tämän tuotteen asennuksen, lue julkaisussaVaroitus: Turvaohjeet—Lue tämä ensin, SD21-0030, olevat turvaohjeet. Tässäkirjasessa on ohjeet siitä, miten sähkölaitteet kaapeloidaan ja kytketään turvallisesti.

xii 8271 Nways EN LAN Switch Planning and Installation Guide

Vigyázat: Mielôtt megkezdi a berendezés üzembe helyezését, olvassa el aCaution: Safety Information— Read This First, SD21-0030 könyvecskében leírtbiztonsági információkat. Ez a könyv leírja, milyen biztonsági intézkedéseket kellmegtenni az elektromos berendezés huzalozásakor illetve csatlakoztatásakor.

Safety Information xiii

xiv 8271 Nways EN LAN Switch Planning and Installation Guide

About This Manual

This manual explains how to plan for, install, administer, and service an IBM 8271Nways Ethernet LAN Switch Model 108 or Model 216

Who Should Read This ManualDifferent sections of this manual are intended for different audiences.

Planning Network planner or administrator

Installation Technician or electrician

Configuration Network administrator

Service Service engineer or network administrator

How This Manual Is Organized¹ Chapter 1, Physical Characteristics and Features of the IBM 8271 Nways LAN

Switch provides a brief overview of the 8271.¹ Chapter 2, Network Planning and Installation Preparations explains how to plan

for installing and configuring an 8271.¹ Chapter 3, Installation describes installation and cabling procedures.¹ Chapter 4, Configuring the 8271 explains how to configure the 8271.¹ Chapter 5, Using the Statistics Panels explains how to view 8271 statistics.¹ Chapter 6, Troubleshooting provides troubleshooting procedures.¹ Chapter 7, Downloading Software and BootP Information describes procedures

for downloading new code.

Prerequisite PublicationsCaution: Safety Information—Read This First, Form Number SD21-0030-02

Related PublicationsIf you need information about permanently installed cabling for Ethernet 10BASE-Tand IBM 8271 installations, consult the EIA/TIA-568 Commercial BuildingTelecommunications Wiring Standard, which is available for a fee from GlobalEngineering Documents, 1-800-854-7179.

Another related publication, available from IBM, is “An Inside Look at IBMWorkgroup Hubs and Switches” May 1995, form number GG24-2528-00.

Copyright IBM Corp. 1996 xv

xvi 8271 Nways EN LAN Switch Planning and Installation Guide

Chapter 1. Physical Characteristics and Features of the IBM8271 Nways LAN Switch

LAN switches are important network components and considered the mostcost-effective way to address the current performance concerns of workgroupLANs. LAN segmentation improves LAN performance by reducing contention, andLAN switches offer a high-performance, low-cost method for interconnecting LANsegments. The IBM 8271 Nways LAN Switch (hereafter referred to as the 8271,Model 108 or Model 216), creates multiple, concurrent paths among connectedEthernet LAN segments, each path supporting the full 10-Mbps Ethernet bandwidth.This chapter discusses the characteristics of the 8271.

The 8271 forwards Ethernet frames among multiple, shared or dedicated EthernetLAN segments via Ethernet 10BASE-T or attachment unit interface (AUI)connections. Similar in function to a multiport Ethernet transparent bridge, the 8271uses Ethernet MAC addresses to forward Ethernet frames from one of its ports toanother.

Management

(EIA 232)

Probe

Reset

OK

I

1 2 3 4 5 6 7 8

Link

FDx

Tx/Rx

Type 8270-001

S/N XXXXXX

MAC Address

XXXXXXXXXXXX

100-240V10

0.4-0.2A 50/60 Hz

MDI

MDI-X

MDI

56

78

12

34

AUI

Management

(EIA 232)

Probe

Reset

OK

I

1 2 3 4 5 6 7 8

Link

FDx

Tx/Rx

9 1 0 1 1 1 2 1 3 1 4 1 5 1 6

Link

FDx

Tx/Rx

MDI-X

MDI

MDI-X

13

5

14

6

15

7

16

8

9

1

10

2

11

3

12

4

AUI

Figure 1-1. The IBM 8271 Nways LAN Switch Model 108 and Model 216

Copyright IBM Corp. 1996 1-1

Product FeaturesThe 8271 comes preconfigured with the appropriate default settings for Plug andPlay capability. You do not have to configure the 8271. The 8271 includes thefollowing features:

IEEE 802.3 complianceFull compliance with the IEEE 802.3 Ethernet Standard.

Transparent switchingPlug and Play provides the following advantages:

¹ Automatic learning of network configuration.¹ Transparency to high-level protocol.

Variable switching modesThe 8271 provides the following switching modes:

¹ Cut-through mode , which provides the benefits of high-speed (less than 50microseconds delay) switching. Frames are forwarded as soon as the addresshas been received.

¹ Store-and-forward mode , which provides more error isolation when theoperating environment demands it. The entire frame must be received andchecked before it is forwarded.

¹ Adaptive mode offers the benefits of both modes. You can configure the 8271to alternate automatically between cut-through and store-and-forward switchingbased on user-specified thresholds.

Runt-Free SwitchingFor added reliability, when the 8271 is operating in Cut-through mode it will notforward packets of less than 64 bytes, thus further reducing the possibility ofcollisions.

Virtual SwitchingThe virtual switch feature allows you to divide a single 8271 into as many as eightseparate domains, or virtual switches, each with its own Internet Protocol (IP)address. Packets are forwarded between ports in the same domain only.

8271 MAC and IP addressThe 8271 comes with a factory-assigned station address (also called a MACaddress). You can also configure the 8271 with an IP address.

MAC AddressesThe 8271 supports a maximum of 1790 active Ethernet MAC addresses per port,but no more than 10 000 for each 8271.

You can configure address table aging parameters by port and for the entire 8271.You can also configure the 8271 to clear space in the address tables when auser-specified threshold is exceeded.

1-2 8271 Nways EN LAN Switch Planning and Installation Guide

MAC address filteringYou can restrict access between certain users or segments. The 8271 controlstraffic on the network by allowing up to 100 MAC addresses to be selectivelyfiltered at the port of entry into the 8271.

EtherPipesYou can configure ports in connected 8271s to create two to four parallel links, thusincreasing capacity between 8271s to support up to 40 Mbps half-duplex (HDX) or80 Mbps full-duplex (FDX).

ManagementConsole management via the serial port or Telnet. You can download softwareupgrades through the serial port or by means of TFTP.

You can initiate a download command from the console menu or as a result ofcorrupted flash detection during the power-on self-test (POST). When you initiatethis command, the 8271 accepts the new downloaded file using the Xmodem filetransfer protocol in a terminal emulator.

Simple Network Management ProtocolThe 8271 selectively accepts either Ethernet or IEEE 802.3 management frames.

StatisticsThe 8271 keeps statistics by port, connected station, and for the entire switch.

Ease and adaptabilityThe 8271 provides

¹ Plug and Play for transparent forwarding ¹ Easy installation¹ Rack or surface mounting

Chapter 1. Physical Characteristics and Features of the IBM 8271 Nways LAN Switch 1-3

Physical Characteristics

1AUI 2 3 4 5 6 7 8Management(EIA 232)

Probe

ResetOK

I

1 2 3 4 5 6 7 8

Link

FDx

Tx/Rx

Type 8270-001S/N XXXXXX

MAC AddressXXXXXXXXXXXX

100-240V 100.4-0.2A 50/60 Hz

AC powerinput

Informationlabels

AUI port 10BASE-T portsMDI-X

MDI/MDI-Xswitch forport 8

Port LEDsEIA 232port

Probeport

PowerOKFault

Resetbutton

System requestbutton

Documenttray

Universalfeature card slot

MDI-X

MDI-X

MDI

Figure 1-2. Locations of LEDs, Switches, and Connectors for Model 108

AC powerinput

Informationlabels

AUI portAUI port 10BASE-T portsMDI-X

MDI port 16Port LEDsEIA 232port

Probeport

PowerOKFault

Resetbutton

System requestbutton

Documenttray

Universalfeature card slots

Management(EIA 232)

Probe

ResetOK

I1 2 3 4 5 6 7 8

Link

FDx

Tx/Rx

9 1 0 1 1 1 2 1 3 1 4 1 5 1 6

Link

FDx

Tx/Rx

MDI-X

MDI

MDI-X

13

5

14

6

15

7

16

8

9

1

10

2

11

3

12

4

AUI

Figure 1-3. Locations of LEDs, Switches, and Connectors for Model 216

EIA 232 PortThis 9-pin, male, management port functions as a data terminal equipment (DTE)port.

With this port you can attach a terminal or terminal emulator to use whencustomizing the switch’s configuration, monitoring switch activity and status, andtesting the switch. Console access can be either local, by direct attachment to theEIA 232 port, or remote, through a modem connection.

Service Information CardStore the Service Information Card in the document tray shown in Figure 1-2 andFigure 1-3. This card explains the LEDs and their meanings, and provides spacefor you to record cabling information.


Ethernet PortsWhether connected to shared- or dedicated-media LAN segments, you can connecteach of the fixed 10BASE-T ports on the switch to a port on any external10BASE-T hub or repeater, using your own UTP cable. Alternatively, a 10BASE-Tport on the 8271 can be connected directly to an HDX or FDX Ethernet LANworkstation without an intervening Ethernet repeater or hub.

RJ-45 Connectors

¹ Model 108 includes eight shielded RJ-45 connectors for 10BASE-T connection.

¹ Model 216 includes sixteen shielded RJ-45 connectors for 10BASE-Tconnection.

Duplex Mode

¹ Ports allow HDX connections to other switches, hubs and end nodes, or FDXconnections to other switches and end nodes.

MDI or MDI-X

¹ Model 108 ports 1–7 are configured as medium-dependent interface crossed(MDI-X). Port 8 has a push button to convert from medium-dependent interface(MDI) to MDI-X.

¹ Model 216 ports 1–15 are configured as MDI-X. Port 16 has two connectors;one is MDI-X and the other is MDI. You can use only one of these connectionsat any time.

AUI connector

¹ One automatically configured AUI connector.

¹ Use the AUI port in place of the first 10BASE-T port. All ports, including theAUI port, are FDX capable.

¹ The AUI port enables you to connect an 8271 to a 10BASE5, 10BASE2, or10BASE-Fn network segment by using the appropriate transceiver or mediumattachment unit.

Shielded Twisted-Pair Cables

¹ Support for the IBM Cabling System via 150-ohm, shielded twisted-pair (STP)cables with impedance-matching baluns.

EtherProbe PortThe EtherProbe port is labeled “Probe” (see Figure 1-2 on page 1-4 andFigure 1-3 on page 1-4).

A network analyzer attached to the EtherProbe port can monitor any of the10-Mbps Ethernet ports. FDX ports can be monitored by an HDX network analyzerby configuring the port to monitor either transmitted or received data.


Universal Feature Card Slot and CardsModel 108 has one UFC slot and Model 216 has two UFC slots that willaccommodate optional, field-installable, UFCs that provide either additionalconnections or functionality. (See Figure 1-2 on page 1-4 and Figure 1-3 onpage 1-4.)

Current UFCs provide the following types of connections:

¹ One-port, 100BASE-T Ethernet¹ One-port, 100BASE-FX Ethernet¹ Three-port, 10BASE-FL Ethernet¹ Four-port, 10BASE-T Ethernet

Future UFCs will provide the following types of connections:

¹ One-port, 155-Mbps ATM¹ One-port, FDDI DAS/Fiber¹ One-port, FDDI SAS/Fiber¹ One-port, FDDI SAS/UTP

¹ One-port RMON

Reset ButtonAttention : The 8271 has a Reset button, that is located on the front panel of theswitch. Pressing the Reset button resets the hardware and software and clears alltables and memory, including the address tables. Pressing the Reset button doesnot clear those values stored in non-volatile random access memory (NVRAM).

System Request ButtonAttention : This unlabeled button is located on the front panel beside the Resetbutton. Pressing the button causes the System Request Menu to appear on theconsole device attached to the EIA 232 port. See “Initiating a Download with theSystem Request Menu” on page 7-3 for more information.

Note: This function should be used only at the direction of service personnel.

Status and Activity IndicatorsThe 8271 has three general status LEDs, and each 10BASE-T and AUI port hasthree LEDs. Refer to Figure 1-2 on page 1-4 and Figure 1-3 on page 1-4 for thelocations of all the LEDs.

Table 1-1 lists the status LEDs and their meanings.

Table 1-1 (Page 1 of 2). Status LEDs and Their Meanings

LED Position State Meaning

| (Power)(green)

Top On The 8271 power supply current is good.

Off The 8271 power supply current is bad.

OK (green) Middle On The 8271 is working correctly.

Off The 8271 is not working correctly.


Table 1-2 lists the port LEDs and their meanings.

Table 1-1 (Page 2 of 2). Status LEDs and Their Meanings


Unlabeled(Fault)(amber)

Bottom On A power-on failure has occurred.

Off The 8271 is working correctly.

Blinking Diagnostics are in progress.

Table 1-2. Port LEDs and Their Meanings

LED Position Meaning When On

Link (green) Top A cable is connected to the 10BASE-T port, the portdetects that a device is connected to the other end of thecable, and the port is receiving a link pulse from thedevice.

FDX (green) Middle The port has been set to full-duplex mode.

Tx/Rx (green) Bottom Data is being transmitted or received by the port.

Note: The port 1 Tx/Rx LED might blink even if there is no device attached to it becauseport 1 defaults to AUI. This is normal.

Physical DimensionsTable 1-3. Port LEDs and Their Meanings

Model 108 Model 216

Width 440 mm (17.3 in.) 440 mm (17.3 in.)

Depth 356 mm (14 in.) 356 mm (14 in.)

Height 66 mm (2.6 in.) 88 mm (3.5 in.)

Weight 6.4 kg (14 lb) 7.8 kg (17 lb)

Power RequirementsThe 8271’s auto-ranging power supply operates on line voltage in the range of 100to 127 or 200 to 250 V ac, and 50/60 Hz. An appropriate power cord is shippedwith the 8271.


Operating EnvironmentTemperature 10° to 40° C (50° to 104° F)

Relative Humidity 8% to 80%

Maximum Wet-Bulb Temperature 27° C (81° F)

Calorific ValueModel 108Model 216

70 kcal/hr (275 BTU/hr)125 kcal/hr (500 BTU/hr)

Electrical PowerModel 108Model 216

0.16 kVA0.24 kVA

Capacity of Exhaust 0.4 m3/min (10.6 ft3/ min)

Noise Level 56 dB

Leakage/Starting Current 0.5 ma/40 amperes/half cycle

Functional OverviewThe 8271 forwards Ethernet frames at media speeds. With a parallel internaldesign, the 8271 can maintain media-speed frame transfer between each of thepossible four (for the Model 108) or eight (for the Model 216) distinct pairs of portssimultaneously. This feature means Model 108 provides up to 40 Mbps in HDXmode and up to 80 Mbps if all ports are FDX-enabled. The Model 216 provides upto 80 Mbps in HDX mode and up to 160 Mbps in FDX mode. Networks with trafficpatterns able to take full advantage of the 8271 could sustain throughput equivalentto four or eight 20-Mbps connections.

You can connect the 8271 fixed ports to the following devices:

¹ Another switch ¹ Shared media ¹ Dedicated media

Shared MediaShared-media LAN segments consist of two or more Ethernet LAN stations that arepart of the same collision domain and share the 10 Mbps associated with thatsegment. The collision domains of attached segments stop at the 8271.

Dedicated MediaDedicated-media LAN segments consist of a single Ethernet LAN station that isable to use the entire 10 Mbps (HDX) or 20 Mbps (FDX) associated with thatsegment. The collision domains of attached segments stop at the 8271.


Management and ControlYou can configure the 8271 by connecting a DEC VT-100-compatible terminal tothe EIA 232 port on the front panel of the switch. You can connect this terminaldirectly to the 8271, or you can connect remotely using a modem. You can alsouse this terminal to view status and statistics, load code and to control 8271functionality.

As an alternative to management via the serial connection, the 8271 contains anSNMP (MIB-II compliant) management agent that allows you to examine andmodify management data, and to obtain status on, or control of, 8271 operationusing your own SNMP management station, such as the IBM NetView for AIXprogram or the IBM NetView for Windows program.

You can also use a Telnet session to view or contol the 8271.

Upgrades to the functional code within the 8271 can be effected through the sameserial port on the front of the switch used for configuration. The code isdownloaded from a workstation using the Xmodem protocol.

Code upgrades can also be accomplished using TFTP.


Chapter 2. Network Planning and Installation Preparations

PreparationsThe following suggestions will help you prepare for the installation of your 8271switch:

1. Make a sketch of the network to which you will be adding one or more 8271s,especially if your institution is a large one. Be sure to include major elementsof the network such as hubs and concentrators as well as servers, bridges, androuters.

2. Get connectivity and physical planning information about the network segmentsto which you will be attaching your 8271.

3. If you will be using permanently installed telecommunications wiring, getinformation about the cabling installation that will allow you to determine thetermination points of every cable, the cable type, connector type (if any), andthe distance between termination points.

4. Get building floor-plans and wiring closet layouts.

Rules to RememberThis section will help you understand the physical configuration restrictions for the8271. In brief, you must remember the following rules when planning to install the8271:

¹ For shared-media LAN segments, acceptable cabling distances are defined bythe hub or concentrator attached to the 8271 port.

¹ Use a star-wired topology when interconnecting 8271s.

¹ Read the READ.ME file shipped with this product for any new restrictions orcautions.

The following sections provide greater detail about the physical restrictions.

Cables and Distances between DevicesDevices attached to the RJ-45 jacks on the front of the 8271 follow the cablingrules established in the IEEE 802.3 standard for 10BASE-T Ethernetimplementations. For installations where permanently installed building cabling isavailable, UTP category 3, 4, or 5 cabling up to 100 m (328 ft), including patch andequipment cabling, can be used. Termination hardware should always match thecategory of cable that is terminated on it.

IBM Cabling System 150-ohm, STP cables (types 1 and 9) can also be usedfollowing the same distance restrictions as the UTP cables. Because the RJ-45connectors on the 8271 use pins 1, 2, 3, and 6, a cable with an IBM STP dataconnector on one end and an RJ-45 connector on the other must be constructed.Figure B-3 on page B-3 illustrates how to build this cable.

Installations using 150-ohm, STP or STP-A cabling must use impedance-matchingbaluns at each workstation or repeater attached to the 8271. In addition, each port


on the 8271 that uses 150-ohm, STP or STP-A cable should have a balun attachedto it.

For installations where cabling will be done using patch cables, the same distancelimitations apply. Be careful to make sure that the patch cables are made up ofcomponents that are at least category 3 UTP or better. IBM Cabling System150-ohm, type 6 patch cables can also be used following the same rules as forpermanently installed STP or STP-A cables.

The AUI connector on port 1 and the Probe port require a standard AUI cable. It isconstructed like the one in Figure B-5 on page B-3. The maximum length of anAUI cable between the 8271 and the transceiver is 50 m (164 ft). AUI cablesprovide a means of connecting 10BASE2, 10BASE5, and fiber network segments.

Note: If an AUI cable is attached to the AUI connector of port 1, you cannot usethe RJ-45 connector at port 1 to provide attachment to another segment.

Crossover CablesCrossover cables are used when connecting like ports, MDI to MDI or MDI-X toMDI-X. All other 10BASE-T connections use straight-through cables. Figure B-1on page B-2 and Figure B-2 on page B-2 illustrate the correct wiring ofstraight-through and crossover for UTP cables. Figure B-3 on page B-3 andFigure B-4 on page B-3 illustrate the correct wiring of straight-through andcrossover for STP cables.

Interconnecting 8271sYou can connect 8271s together to form large networks without violating the10BASE-T repeater rule, because the 8271 is a switch and not a repeater. As inother configurations, the effective capacity between the 8271s is 20 Mbps, whenthe ports on both switches are set up for FDX operation.

The topology of a cascaded network of 8271s is very important from a performanceperspective. A star-wired topology as shown in Figure 2-1 on page 2-3 must beused to achieve maximum bandwidth, and it provides a preferred topology fornetwork problem determination because no single cable carries all of the traffic onthe network. If the topology connected the 8271s serially, each connecting cableand 8271 could potentially divide the network should a failure occur, and capacitywould also be reduced.

Note that Figure 2-1 on page 2-3 shows the lower six Model 108s connected atport 8 (in MDI connection), and the Model 216s connected at the MDI port 16.This is recommended because the MDI makes it easy to get the connectionworking regardless of the cable type (crossover or straight-through) available.

Creating parallel paths directly between two 8271s will result in unsatisfactorynetwork operation unless the spanning tree algorithm or an EtherPipe is configured.Because the spanning tree algorithm was designed especially to prevent loops innetworks that use transparent bridging, the algorithm will block a port of one of the8271s in the parallel paths. If the port in the primary path fails, the port that hasbeen blocked will change automatically to the forwarding state, keeping the networkworking.



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MDIManagement(EIA 232)

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5

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5

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10

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AUI

Figure 2-1. Interconnected 8271s

Chapter 2. Network Planning and Installation Preparations 2-3

Sample ApplicationsThe 8271 allows you to make incremental changes in your network to address bothimmediate and long-range performance challenges. For example, an Ethernet LANof 24 stations and 2 servers might experience performance problems as a result ofincreased traffic. As it is currently structured, the LAN looks like the one inFigure 2-2. All of the stations are attached to four, eight-port, 10BASE-T repeaterslocated in a single wiring closet.

Server

Repeaters

Server

Figure 2-2. Typical Ethernet LAN

Include the 8271 and divide the LAN into four segments of six stations each.Connect the repeater for each segment to a port on the 8271 using a UTP patchcable. Finally, remove the two servers from the repeaters to which they have beenattached and move their cables to two ports on the 8271 (see Figure 2-3).

Each group of six users attached to a repeater now shares a dedicated 10-Mbpspath to the server. Each of the servers now has a dedicated, 10-Mbps path uponwhich to service requests. The overall capacity of this solution is 30 Mbps–athreefold increase.

10 Mbps

20 Mbps20 Mbps

10Mbps

Server Server

8271 10 Mbps

10Mbps

Repeaters

Figure 2-3. Adding the 8271 to a Typical Ethernet LAN

Typically, the first point of congestion in your newly configured network would bethe servers. Because the normal mode of operation for an Ethernet adapter is halfduplex, the servers can either send or receive information with one other segmentattached to the switch. However, if the servers are equipped with full-duplexadapters, such as the IBM EtherStreamer MC 32 Adapter, and are attached as asingle-station segment as shown in Figure 2-3, they can send and receive datasimultaneously. Each server now has a 20-Mbps access to the network. If youuse an IBM Dual EtherStreamer MC 32 Adapter, which requires two ports on the8271, each server now has a 40-Mbps access to the network, as shown inFigure 2-4 on page 2-5.


As more and more high-demand LAN applications become available, users willmigrate from shared-media LANs to dedicated-media LANs. A logical first step inthat migration is to move users from the shared-media LAN segments shown inFigure 2-2 to single-station segments, each attached directly to a port of an 8271switch. Just remove the 8-port repeaters and replace them with 8271 switches.You can link switches by connecting them port-to-port as shown in Figure 2-4. Thethroughput for this configuration is 80 Mbps, an eightfold increase over the original10BASE-T LAN. By using full-duplex adapters you can double the availablecapacity at each of the client stations, as shown at the bottom of Figure 2-4.

20 Mbps 20 Mbps

20Mbps

8271

8271827182718271

Server Server

20Mbps

40 Mbps 40 Mbps

Figure 2-4. Relieving Server Congestion

Filling Out the Planning Charts and WorksheetsAs part of the planning process, the following charts and worksheets might beuseful for you. Copies of the charts are available in Appendix A, “Planning Charts.”Depending upon your network installation, you might not need all of the charts andworksheets provided. For example, a network of a single 8271 and eight directlyattached, single-station segments would not need the Locator Charts. On the otherhand, the 8271 Cabling Chart and the Configuration Parameter Worksheet areuseful for even the smallest LAN segment.

Rack Inventory ChartThe Rack Inventory Chart allows you to keep track of all components installed ineach rack in your establishment to facilitate planning and installation. This chart isparticularly useful for larger installations. See Appendix A, “Planning Charts.”

The IBM 8271 Cabling ChartThe information on the Cabling Chart is used by the installer to place the 8271 inits assigned location and connect the appropriate cables to it.

In the section labeled “Port Type,” for port 1, check the box to indicate whether anAUI or 10BASE-T connection is required. Remember that you can select only oneconnection.

In the section labeled “Cable Type”:

1. For port 1 with an AUI connection, check the AUI box.


2. For all 10BASE-T connections, choose either UTP for 100-ohm, unshieldedtwisted-pair cables or STP for 150-ohm, shielded twisted-pair cables.

3. Then, choose whether the cable should be straight-through or crossover,depending upon the device at the other end. Straight-through cables arerequired between an 8271 and a single-station segment (MDI-X-to-MDIconnections). MDI-to-MDI or MDI-X-to-MDI-X connections use crossovercables. Remember that port 8 on Model 108 can use either kind of cable forany connection. On Model 216 you select the appropriate connector (MDI orMDI-X) as port 16.

Table 2-1 lists the types of ports usually found on attached devices.

4. Check the box at the EIA 232 port if a cable will be permanently attached. Forexample, for easy access to the out-of-band management features of the 8271,you might want it permanently attached to a modem. Indicate whether a nullmodem is required.

5. In the “Connect to” section of the chart, supply enough information to makeattachment to the device at the other end of the port. For example, aconnection to a 10BASE-T repeater in another wiring closet might contain thecable termination points in both closets, the cable number, the unit number ofthe repeater, and the number of the port through which it will be connected tothe 8271. On the other hand, if the repeater is in the same room or rack as the8271, the repeater’s unit number and the port to be used for connection to the8271 is sufficient.

For the EIA 232 port, indicate whether the 8271 is permanently attached to amodem or console.

Table 2-1. Typical Port Types

Connecting Device Typical Port Type

Hub, repeater MDI-X

Server, personal computer, workstation MDI

Model 108 ports 1–7 MDI-X

Model 108 port 8 MDI or MDI-X switchable


Model 216 port 16 MDI or MDI-X

The Service Information CardComplete this card and place it in the document tray under the left, front edge ofthe 8271. Some of the information on the planning charts is duplicated on the card.Should the 8271 require service, the card will be more readily available than theplanning charts.

Planning for Configuration and ManagementUnder some conditions, the 8271 can be used just as it comes from the factory.However, to do so would be suitable in small and simple network environmentsonly. Any SNMP-managed network requires some configuration changes.

To use SNMP management, you must first enter the initial IP address andconfigure SNMP parameters from the console or with BootP. You can use either


the console, Telnet, or an SNMP managing entity, such as Netview for AIX orWindows with the MIBs loaded to view or change all parameters or managementinformation (except for the spanning tree parameters). You can view but notchange the spanning tree parameters from an SNMP manager.

Filling Out the IBM 8271 Configuration Parameters WorksheetYou should prepare one of these worksheets for each 8271 you plan to install inyour network. The items on the worksheet follow the same order as the promptsthat appear on the console attached to the EIA 232 port.

Step 1. Copy the IBM 8271 Configuration Parameters Worksheet found inAppendix A, “Planning Charts.”

Step 2. Fill out this worksheet while you read through “Configuring the 8271Using Console Panels” on page 4-8. Be sure to indicate the locallyassigned unit number at the top of the worksheet. The worksheet shouldbe filled out either before you configure the 8271 or while you areconfiguring it. It is important to have a completed, accurate worksheet onfile because it represents the only backup for the configuration data in the8271 itself.

Filling Out the Locator ChartsEach of the attaching devices in your establishment is assigned to a specificphysical location. Further, each attaching device has a unique identificationnumber. You have used these identifiers to indicate specific attaching devices onyour cabling charts.

On the network, however, an attaching device is known not by its location orassigned identification number, but by its MAC address. This address can be oneof two types: universally administered or locally administered. Find out the MACaddress of each attached device, using its documentation if necessary.

In addition, the 8271 has a universally administered base MAC address that can bedisplayed on the console by looking at the System Information Menu. It is alsoprinted on the label as shown in Figure 2-5 on page 2-8. Each port and eachconfigured virtual switch also require a MAC address. The base MAC addressends in 0 and each port increments the number by one. For example, the port 1MAC address is the same as the base MAC except that it ends in 1, port 5 ends in5, and so forth. Each configured virtual switch or domain assumes the MACaddress of the lowest-numbered port in the domain.


Management(EIA 232)

ResetOK

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100-240V 010.4-0.2A 50/60 Hz

Serial Number

Address

Voltage

Figure 2-5. 8271 Labels

The locator charts relate adapter addresses to the physical location and deviceidentification numbers. These charts are useful for problem determination andshould be kept current, especially in larger installations.

Step 1. Make a copy of the charts found on pages A-14 and A-15.

Step 2. On the Adapter Address to Physical Location Locator Chart, record theaddresses of all devices in the network in numerical order.

Step 3. On the Physical Location to Adapter Address Locator Chart, record thephysical locations of all devices by building and room number.

Step 4. In the “Device Identification” column on both charts, in addition to enteringthe device identification, you should also indicate such functions asswitches, hubs, print servers, file servers, gateways, and bridges.


Chapter 3. Installation

This chapter explains the equipment that you need to install the 8271 anddescribes the installation procedure.

Before installing the 8271, be sure to read “Electronic Emission Notices” inAppendix C on page C-1.

Installation SummaryTable 3-1 outlines the steps you must complete to install the 8271.

Table 3-1. 8271 Installation Procedures

Step Procedure Reference

1. Read the safety manual shippedwith the 8271.

Form number SD21-0030

2. Plan for installation. Chapter 2, “Network Planning andInstallation Preparations”

3. Unpack the 8271. “Unpacking Instructions”

4. Gather materials. “Gather the Other Materials You Will Need”on page 3-2

5. Install the UFC. “Installing a Universal Feature Card” onpage 3-2

6. Mount the 8271. “Setup” on page 3-3

7. Connect the 8271 to the network. “Cabling” on page 3-5

8. Verify the operation of the 8271. “Powering On the 8271” on page 3-8

Note: Complete the following step only if you will be customizing the configuration of the8271 or monitoring its activity.

9. Configure the 8271. Chapter 4, “Configuring the 8271”

Unpacking InstructionsThere are no special safety precautions that need to be taken when unpacking the8271. Simply follow these steps:

Step 1. Open the large carton.

Step 2. Remove the power cord, publication package, and cable managementbracket.

Step 3. Remove the 8271 from its protective packaging.

Step 4. Visually inspect the 8271 to ensure that it was not damaged duringshipment.

Step 5. Verify that the items listed here are in the package.

Along with this manual, the package should contain:

Ø One 8271 with mounting brackets attachedØ One cable management bracketØ One SNMP MIB diskette


Ø One power cordØ One safety manualØ One Service Information Card

If any item is missing or damaged, contact your place of purchase.

Gather the Other Materials You Will NeedTo install the 8271, you need the following items:

¹ If the unit will be installed in a rack, you need:

– A rack inventory chart and a cabling chart from your network administrator.

– Screws (two for Model 108, four for Model 216) appropriate for your rackand a suitable screwdriver. (Make sure that you have the appropriatescrews before you begin installation.)

– The cable management bracket (shipped with the 8271).

¹ If the unit will be installed on a surface (such as a tabletop), you will need:

– A cabling chart from your network administrator.– A flat-tip screwdriver for reattaching the mounting brackets to the 8271.

Installing a Universal Feature CardFollow these steps to install a UFC if you have received one.

Step 1. Remove the UFC from its box.

Step 2. Remove the plate covering the UFC slot on the front of the 8271 byremoving the two thumbscrews holding it in place. See Figure 3-1.Retain the plate and thumbscrews for use in the event that the UFC isever removed.

Step 3. Insert the card in the UFC slot carefully, making sure that the connectoron the card is seated in the connector at the back of the slot.

Step 4. Secure the card with the two thumbscrews attached to it. This isillustrated in the publication that is shipped with the UFC.

Figure 3-1. Removing the UFC Slot Cover


Step 5. Continue with the instructions under “Setup” on page 3-3.

SetupUse the IBM 8271 Cabling Chart in Appendix A, “Planning Charts,” to determinewhether the switch will be mounted in a rack or on a surface (such as a tabletop).

Step 1. If the 8271 is to be rack mounted (the preferred mounting style), continuewith “Rack Mounting the 8271.”

Step 2. If it is to be surface mounted, go to “Surface Mounting the 8271” onpage 3-4.

Rack Mounting the 8271Follow these steps to mount the 8271 in a rack:

Step 1. Look at the rack inventory chart provided by your network administrator todetermine where in the rack the 8271 should be mounted.

Step 2. Obtain two screws that fit the mounting holes in the rack and put themand the cable management bracket within reach of the front of the rack.

Step 3. Place the 8271 in the rack, lining up the holes on the rack with those onthe mounting brackets. Only two holes are needed for mounting Model108. Model 108 takes up 1.5 units in a standard EIA rack. When the topof the Model 108 is even with an EIA unit boundary, the bottom bracketholes align with holes in the rack. When the top of the 8271 is in themiddle of an EIA unit, the top bracket holes will align with holes in therack.

Model 216 takes up 2 units in a standard EIA rack and requires fourscrews.

Step 4. While supporting the 8271, secure only the left-hand side of the unit withone of the screws.

Step 5. Align the hole in the cable management bracket with the hole on theright-hand mounting bracket and the rack. Using the other screw, securethe cable management bracket and the right-hand side of the unit in therack, as shown in Figure 3-2 on page 3-4.

Chapter 3. Installation 3-3

Figure 3-2. Rack Mounting the 8271

Step 6. Continue with the instructions under “Cabling” on page 3-5.

Surface Mounting the 8271Step 1. Using a screwdriver, loosen the four screws that attach the two mounting

brackets to the sides of the 8271.

Note: Do not remove the center screw on each side of the 8271. Thisscrew secures the cover to the unit.

Step 2. Rotate the brackets and reattach them to the 8271 as shown inFigure 3-3.

Type 8270-001

S/N XXXXXX

Type 8270-001

S/N XXXXXX

MAC Address

XXXXXXXXXXXX

MAC Address

XXXXXXXXXXXX

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0.4-0.2A 50/60 HzNote tab position.

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Management

(EIA 232)

Management

(EIA 232)

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Reset

Figure 3-3. Attaching the Mounting Brackets for Surface Mounting

Step 3. Continue with the instructions under “Cabling” on page 3-5.


CablingThis section provides instructions for connecting devices (such as hubs, servers,personal computers, and workstations) to an 8271. Remember these tips whenconnecting cables:

¹ Avoid stretching or bending the cables excessively.

¹ Avoid routing the cables near potential sources of electromagnetic interference,such as motorized devices and fluorescent lights.

¹ Avoid trip hazards by routing the cables away from aisles and other areaswhere people walk. If such routes cannot be avoided, use floor cable covers orsimilar material to secure and protect the cables.

¹ Be sure that the cables connected to the 8271 are supported so that the cableconnectors are not excessively strained.

¹ Use a category 3 or better UTP cable or a 150-ohm, STP or STP-A cable withan impedance-matching balun at each end.

Connecting Devices to the 10BASE-T PortsIf you will not be using building wiring (in-the-wall cables) to connect the device tothe 8271, perform the following steps. If you will be using building wiring, follow thesteps beginning with step 1 on page 3-6.

Follow these steps to connect one or more devices to the 10BASE-T ports on an8271:

Step 1. Using the IBM 8271 Cabling Chart provided by your network administratoras a guide, connect the cables between the 8271 and other devices asillustrated in Figure 3-4 on page 3-6. Remember that MDI-to-MDI andMDI-X-to-MDI-X connections require crossover cables and MDI-X-to-MDIconnections require straight-through cables.

Notes:

a. Do not use the 10BASE-T connector of port 1 if you plan to use theAUI connector of port 1. They are mutually exclusive.

b. For Model 216, you can only use either the MDI or MDI-X connectoron port 16. The two are mutually exclusive.


Figure 3-4. Connecting Devices to 10BASE-T Ports

Step 2. Dress the 8271 end of the cables to the right, through the cablemanagement bracket.

Step 3. Label each end of the cables so that it will be easy to find the device ifyou have to troubleshoot a network problem. You should also put theinformation on the “Cable Destination” area of the Service InformationCard.

Suggested information to place on the label includes the room location ofthe device at the other end, a unique cable identification number, theMAC address of the connected device, and the number of the port towhich the cable is attached.

Step 4. To continue installing the 8271, go to “Connecting to the AUI Port” onpage 3-7 if you plan to connect an AUI cable. Otherwise, go to“Powering On the 8271” on page 3-8.

Connecting Devices to the 10BASE-T Ports Using Building WiringIf you will use building wiring (in-the-wall cables) to connect the device to the 8271,perform the following steps:

Step 1. Using the IBM 8271 Cabling Chart provided by your administrator as aguide, connect the cables between the devices and the faceplates asillustrated in Figure 3-5 on page 3-7. Remember that MDI-to-MDI andMDI-X-to-MDI-X connections require crossover cables and MDI-X-to-MDIconnections require straight-through cables.


Straight-ThroughCable

To 10BASE-TPorts

Straight-Throughor CrossoverCable

Faceplate

Work AreaWiring Closet

Building Wiring(10BASE-T Cable)

10BASE-TPort on Device


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100-240V 100.4-0.2A 50/60 Hz

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MDI-X

MDI

Figure 3-5. Connecting Devices to 10BASE-T Ports Using Building Wiring

Step 2. Label the faceplate using local practices, so that it will be easier to findthe device if you have to troubleshoot a network problem.

Step 3. In the wiring closet, connect a cable to the 10BASE-T connector on thepatch panel or other equipment where the building wiring terminates.Connect the other end of the cable to a 10BASE-T port on the 8271.

Note: Do not use the 10BASE-T connector of port 1 if you plan to use the AUI connector of port 1. They are mutually exclusive.

Step 4. Label this cable.

Step 5. To continue installing the 8271, go to “Connecting to the AUI Port” if youplan to connect an AUI cable. Otherwise, go to “Powering On the 8271”on page 3-8.

Connecting to the AUI PortTo connect the 8271 to a 10BASE5, 10BASE2, or 10BASE-Fn network segment viathe AUI port, perform the following steps:

Step 1. Disable the Signal Quality Error (SQE) (also known as the heartbeat) onthe external transceiver, as described in the transceiver documentation.

Step 2. The 8271 AUI port has a slide latch that secures AUI cables or mediaaccess units. Open the latch by sliding it to the left. The slide latch isshown in Figure 3-6.


AUI PortSlide Latch

1AUI8

Link

FDx

Tx/Rx

Figure 3-6. Slide Latch on the AUI Port

Step 3. Connect one end of the AUI cable to the AUI port of the 8271 and theother end to a 10BASE5, 10BASE2, or 10BASE-Fn transceiver mediaaccess unit as indicated by the cabling chart. See Figure 3-7 for anillustration of these connections.

Depending on the type of transceiver you use and the distance betweenthe transceiver and the 8271, you might be able to connect thetransceiver directly to the 8271 without using an AUI cable.

OptionalAUI Cable(maximum length50 m)

AUI PortEthernetTransceiver

AUI Port

1AUI8

Link

FDx

Tx/Rx

Figure 3-7. Connecting an AUI Cable

Step 4. Secure the AUI cable (or the transceiver) in place on the 8271 port bypushing the slide latch on the 8271 AUI port to the right.

Powering On the 8271To power on the 8271 and to verify that it is operating correctly, perform thefollowing steps:

Step 1. Connect the power cord to the 8271 and then to an electrical outlet. The8271 does not have a power switch. The 8271 is powered on when youplug in the power cord.

Step 2. Verify that the Power LED (|) on the left side of the front panel of the8271 is lit. If it is not lit, make sure that the outlet is working correctly. If


the outlet is working but the Power LED is not lit, contact your place ofpurchase.

Step 3. Verify that a Link LED is lit for each 10BASE-T port that is connected to apowered-on device. If not, see Chapter 6, “Troubleshooting.”

Note: The AUI port does not have a corresponding Link LED. If you areusing the AUI connector, the port 1 Link LED will not be lit.

Step 4. Verify that diagnostics have been completed successfully.

The 8271 automatically performs diagnostics once it is connected to apower supply. Diagnostics can last up to 5 minutes. (The Model 216 willtake longer than the Model 108.) Figure 3-8 shows the pattern of theStatus LEDs as the 8271 performs diagnostics.

1 Power on to 1.5 minutes

2 1.5 minutes to 5 minutes

3 After 5 minutes

Management(EIA 232)

Management(EIA 232)

Management(EIA 232)

Reset

Reset

Reset

OK

OK

OK

I

I

IPower LEDOK LEDFault LED

- On- Off- Off

OnOff

Alternating On-Off

OnOnOff

Figure 3-8. Pattern of the Status LEDs during Diagnostics

When diagnostics have been completed, the Tx/Rx LEDs will blink if the8271 detects activity. Note that the Tx/Rx LED that corresponds to port 1will blink when the 8271 sends frames even if a device is not attached tothat port. Port 1 defaults to an active AUI port if a 10BASE-T connectionis not made to port 1.


a If the LEDs are not in the normal state, go to Chapter 6,“Troubleshooting.”

b If diagnostics have been completed successfully and all of the LEDsare in the normal state, physical installation of the 8271 is complete.

To continue with the installation, go to Chapter 4, “Configuring the 8271.”

Table 3-2. Normal States of LEDs

LED Normal State

Power (|) On

OK On

Fault (unlabeled) Off


Chapter 4. Configuring the 8271

You do not have to configure the 8271 for it to work in your network; it is shippedwith default configuration parameters and can function with these defaults.However, a console interface via the EIA 232 port is provided for customizing theconfiguration of the 8271, monitoring its activity, and troubleshooting problems.This chapter tells you how to set up a console session and configure the 8271.

For illustration purposes, you will notice some of the domains have been namedaccording to possible realistic scenarios. For example, you may see a domainnamed finance instead of Domain n or Default.

Default Configuration ParametersParameter Default Setting Virtual Switch Assignment All ports are assigned to domain 0, which is

named Default .For further information, see “ConfiguringVirtual Switch Ports” on page 4-13.

IP Address 0.0.0.0For further information, see “Configuring IPParameters” on page 4-17.

Default Gateway 0.0.0.0

For further information, see “Configuring IPParameters” on page 4-17.

Subnet Mask 0.0.0.0For further information, see “Configuring IPParameters” on page 4-17.

IP State BootP When NeededFor further information, see “Configuring IPParameters” on page 4-17.

Send Authentication Traps YesFor further information, see “ConfiguringSNMP” on page 4-19.

Participate in Spanning Tree NoFor further information, see “ConfiguringSpanning Tree” on page 4-22.

Switch Priority 32 768(if participating in Spanning Tree)For further information, see “ConfiguringSpanning Tree” on page 4-22.

Switch Hello Time 2 seconds(if participating in Spanning Tree)For further information, see “ConfiguringSpanning Tree” on page 4-22.


Switch Maximum Message Age 20 seconds(if participating in Spanning Tree)For further information, see “ConfiguringSpanning Tree” on page 4-22.

IP Packet Type EthernetFor further information, see “Configuring IPParameters” on page 4-17.

Switch Forward Delay 15 seconds(if participating in Spanning Tree)For further information, see “ConfiguringSpanning Tree” on page 4-22.

Port Priority 128(if participating in Spanning Tree)For further information, see “Setting PortPriority” on page 4-24.

Port Cost 100(if participating in Spanning Tree)For further information, see “Setting Port PathCost” on page 4-26.

All Port Switching Modes (Auto)AdaptiveFor further information, see “Viewing orChanging Port Switching Mode” onpage 4-47.

All Port Status EnabledFor further information, see “Viewing PortConfiguration” on page 4-30.

You can change any of the preceding default parameters for the 8271 through aPC or other DTE to the EIA 232 port on the 8271. To do so, continue with“Preparing to Configure the 8271.”

Preparing to Configure the 8271Preparations for configuring the 8271 involve configuring UFCs (see “ConfiguringUniversal Feature Cards”) and setting IP parameters (unless you are connectingdirectly to a console)in one of the following two ways:

¹ Using BootP then SNMP¹ Using a console session and then SNMP

To use BootP, see Chapter 7, “Downloading Software and BootP Information.” Touse SNMP see “Configuration Using the SNMP-Based Manager” on page 4-3. Touse a console session, continue with “Setting Up a Console Session” on page 4-4.

Configuring Universal Feature CardsIf you are installing a UFC with your 8271, go to the configuration instructionsshipped with it now.


If you are required to load new microcode, do so before continuing. If youconfigure the 8271 and then load new microcode, the configuration data might belost.

Configuration Using the SNMP-Based ManagerEach 8271 kit has a diskette containing the private MIBs necessary for managingan 8271 with an SNMP-based network manager, such as Nways Campus ManagerLAN for AIX, Nways Manager for Windows, or Nways Campus Manager LAN forHP-UX.

The SNMP agent in an 8271 maintains five management information bases (MIBs),consisting of objects that contain information about the 8271’s identity, status, andresources. The SNMP network manager can request that the 8271 reportinformation in the MIBs or set values in the MIBs.

Four of the five MIBs are standard MIBs. The 8271 SNMP agent implements someelements of each of these five MIBs, which are listed in Table 4-1 along with theInternet Requests for Comments (RFCs) that define them. These standard MIBsare included with most SNMP management applications.

Step 1. If your network is SNMP managed, give this diskette to the networkmanagement operator so that it can be compiled into the SNMP-basednetwork manager.

Table 4-1. MIBs Implemented in the 8271 SNMP Agent

MIB RFC

The IBM 8271 MIB N/A

Management Information Basefor Network Management ofTCP/IP-based Internets: MIB-II

1213

Evolution of Interfaces Groupof MIB-II

1573

Definitions of Managed Objectsfor the Ethernet-like InterfaceTypes

1643

Definitions of Managed Objectsfor Bridges

1493

Note: Printed copies of RFCs are available for a fee from:

SRI International, Room EJ291333 Ravenswood AvenueMenlo Park, CA 94025

(415) 859-3695 (415) 859-6387

FAX (415) 859-6028

Request a softcopy of an RFC through an Internet mail gatewayservice (ATTMAIL, MCIMAIL, CompuServe, BITNET, and so on)as follows: Address: [email protected]

Subject: RFC numbernumber is the number of the RFC you are requesting.

Chapter 4. Configuring the 8271 4-3

Step 2. If you are not currently using an SNMP manager, store the diskette forfuture use.

Note: If you are using SNMP management, once you have entered the initial IPaddress and SNMP configuration parameters from the console, you can use eitherthe console or an SNMP managing entity with the MIBs loaded to view or changeall parameters or management information except spanning tree parameters.

Setting Up a Console SessionYou can set up a console session locally by directly connecting a PC or other DTEto the EIA 232 port on the 8271. You also can set up a console session remotelyby connecting a modem to the EIA 232 port and then dialing in from your remotestation. To connect a terminal directly to the 8271, follow the directions under“Connecting a Local Terminal.” To use a modem, follow the directions under“Connecting a Modem to Allow Remote Terminal Access” on page 4-5.

Connecting a Local TerminalTo connect a terminal to the 8271, perform the following steps:

Step 1. Begin running your terminal emulation software on the PC or other DTEto which you will be connecting the 8271.

Step 2. Set the terminal as follows:

Note: All emulators do not have all the options listed below.

Baud rate 1200, 2400, 4800, 9600, 19 200, 38 400(9600 is the default)

Parity NoneData bits 8Stop bits 1Handshaking NoneTerminal emulation VT100Duplex FullSoft flow control (XON/XOFF) OffHard flow control (RTS/CTS) OffLine wrap OffScreen scroll OnCR translation CRBackspace (BS) translation DestructiveBreak length (milliseconds) 350


Enquiry (ENQ) OffEGA/VGA true underline OffTerminal width 890ANSI 7- or 8-bit commands 7

Step 3. If you are using Microsoft Windows terminal emulation, disable the “UseFunction, Arrow, and Ctrl Keys for Windows” option, located in theTerminal Preferences menu under “Settings.”

Step 4. Connect the EIA 232 port on the 8271 to your PC or DTE device using anull-modem cable or straight-through cable and null-modem adapter. The8271 has a 9-pin, male connector. For pinout and cable information, seeAppendix B, “Cable and Pin Information.”

Step 5. Plug in the 8271 if you have not already done so, or press the resetbutton. (Note that the 8271 does not have a power switch; the 8271 ispowered on when you plug in the power cord.) The 8271 will thenperform a series of self-test diagnostics, which last about 4 minutes.

Step 6. When diagnostics have been completed, continue with the steps under“Beginning the Console Session” on page 4-6.

Connecting a Modem to Allow Remote Terminal AccessYou can monitor the 8271 remotely by using any Hayes-compatible modem. Toconnect a modem to the 8271, perform the following steps:

Step 1. Set up your modem according to its instructions. Place it near the 8271.

Step 2. Connect the cable from the EIA 232 port on the modem to the EIA 232port on the 8271. (For cable information, see Appendix B, “Cable andPin Information.”)

Step 3. Set the modem as follows:

Note: All modems might not have all these options. Also, somemodems use slightly different names for the options.

Wait for connection 45 secondsPause between calls 6 secondsAuto baud detect OnDrop DTR between calls YesSend CR between calls YesSend init if CD high YesMaximum dial attempts 999

Step 4. Prepare your remote terminal by following steps 1 and 2 under“Connecting a Local Terminal” on page 4-4.

Step 5. Dial in to the 8271 modem from your remote site.

Step 6. Continue with “Beginning the Console Session” on page 4-6.


Beginning the Console SessionAfter you have connected and configured a local or remote terminal, proceed asfollows:

Step 1. Press Enter repeatedly until a menu similar to the one in Figure 4-1appears on your display. If no menu appears, make sure that you havemade all of the correct settings and are using the correct type of cables.

�@ �IBM 8271 Nways LAN Switch Model-216 Manager Version 1.0

(c) Copyright Cisco Systems, Inc., 1995 - All rights reserved.(c) Copyright International Business Machines Corporation, 1995 -

All rights reserved.

MAC Address: 00 04 AC A4 00 00

System Contact: John Smith

Type Password, then press <ENTER>:

-- No password has been set, press <ENTER> to continue. --

� �Figure 4-1. Copyright Panel

Step 2. Type the password, if one has been configured. The default password ispressing Enter.

Note: If you have forgotten your password, press the System Requestbutton to access the System Request Menu, and then Clear NVRAM.This will clear the password but will also set all configuration parametersto their default values, clearing any values you have entered.

Step 3. Then, press Enter to advance to the Main Menu as shown in Figure 4-2on page 4-7.


�@ � Main Menu

Configuration...

Statistics...

Download...

Reset...

Exit Console

Display the Configuration MenuUse cursor keys to choose item. Press <ENTER> to confirm choice.

Press <CTRL><N> to exit console.� �

Figure 4-2. Main Menu

Configuration MenuSelecting the Configuration Menu will provide you with a series of panelsthat enable you to configure the 8271. For details about the configurationprocess, go to “Configuring the 8271 Using Console Panels” on page 4-8.

Statistics MenuSelecting the Statistics Menu will provide you with information that allowsyou to monitor the 8271. For an overview of this information, go toChapter 5, “Using the Statistics Panels.”

Download MenuAllows downloading new microcode via the EIA 232 port or TFTP asexplained in Chapter 7, “Downloading Software and BootP Information.”

Reset MenuDisplays a panel for resetting the 8271, resetting the address tables foreither the 8271 or the individual ports, and running diagnostics. See“Reset Menu” on page 4-56 for more information.

Making and Saving Changes and Other ShortcutsFollow these guidelines during a console session:

¹ To make changes to a parameter, move the cursor to the parameter nameand press Enter . You will then be prompted to enter the new data or selectfrom a list of valid choices.

¹ To save in NVRAM any changes made to the configuration panels, select theReturn to Previous Menu or Return item from the panel whose settings youwant to save.


Note: Selecting the Return to Previous Menu or Return item is the only wayto save any changes made to the configuration panels.

¹ To return to the main menu, press Ctrl+N . Changes made to the currentpanel will not be saved.

¹ To refresh the console screen at any time, press Ctrl+L .

¹ To exit a prompt without taking action, press Esc one or more times.

Configuring the 8271 Using Console PanelsThis section provides reference information on the menus and panels you can useto customize the 8271 configuration.

Step 1. Obtain a completed IBM 8271 Configuration Parameters Worksheet fromyour network administrator. This worksheet will tell you which parametersto change, which settings to use, and which pages in this chapter toreference.

Step 2. Change or enter values according to the worksheet as follows:

a. From the Main Menu shown in Figure 4-2 on page 4-7, selectConfiguration... to advance to the Configuration menu shown inFigure 4-3

�@ �

Configuration

Return to Previous Menu EtherProbe...

Switch Information... EtherPipe...

Virtual Switch Configuration... MAC Filter & Port Security...

IP Configuration... Address Aging...

SNMP Configuration... Port Switching Mode...

Spanning Tree... Broadcast Suppression...

Port Configuration... Password...

Module Information... Console Configuration...

Display the Main MenuUse cursor keys to choose item. Press <ENTER> to confirm choice.

Press <CTRL><N> to return to Main Menu.� �Figure 4-3. Configuration Menu

b. From the Configuration menu, select the menu item you want to workwith by using the arrow keys to space over to that item and pressingEnter . The following list defines the menu options available from theConfiguration menu:


Return to Previous MenuReturns you to the previous menu and saves any new valuesthat you selected.

Switch Information MenuDisplays the Switch Information Menu. See “Viewing SwitchInformation” on page 4-10 for more information.

Virtual Switch Configuration MenuDisplays a panel for configuring domains. See “ConfiguringVirtual Switch Domains” on page 4-12 for more information.

IP Configuration MenuDisplays a panel for changing IP addresses and subnet masksand for sending PINGs. See “Configuring IP Parameters” onpage 4-17 for more information.

SNMP Configuration MenuDisplays a panel for changing attributes related to SNMP. See“Configuring SNMP” on page 4-19 for more information.

Spanning Tree MenuDisplays a panel for viewing or changing spanning treeinformation. See “Configuring Spanning Tree” on page 4-22 formore information.

Port Configuration MenuDisplays a panel for changing the activation or duplex mode ofone or more of the ports. See “Viewing Port Configuration” onpage 4-30 for more information.

Module Information MenuDisplays information about installed UFCs. See “Viewing theModule Information Panel” on page 4-32 for more information.

EtherProbe MenuDisplays a panel for choosing which Ethernet port to monitor withthe Probe port. See “Configuring EtherProbe” on page 4-33 formore information.

EtherPipe MenuDisplays a panel for creating, changing, and deleting anEtherPipe (made up of multiple links) between two 8271s toincrease capacity. See “EtherPipe Configuration” on page 4-34for more information.

MAC Filter & Port Security MenuDisplays a panel for establishing and deleting address filters.See “Configuring the MAC Filter & Port Security” on page 4-37for more information.

Address Aging MenuDisplays a panel for defining address aging rules. See“Configuring Address Aging” on page 4-43 for more information.

Port Switching Mode MenuDisplays a panel for defining the Port Switching mode. See“Viewing or Changing Port Switching Mode” on page 4-47 formore information.


Password MenuDisplays a panel for setting up and changing the password foraccess to the console. See “Configuring and Changing thePassword” on page 4-51 for more information.

Console ConfigurationDisplays a panel for configuring the EIA 232 port. See“Configuring the Console” on page 4-52 for more information.

The following sections describe the menus, panels, and functions available from theConfiguration menu.

When you have changed all of the required configuration parameters, return to theMain Menu. Configuration is complete.

Viewing Switch InformationUse the Switch Information panel to view or change the system description,identification, MAC address, interface description, system name, system location, orsystem contact.

�@ � Switch Information

Return to Previous MenuSystem Description IBM 8271-216 Nways LAN Switch

System ID 1.3.6.1.4.1.2.3.10MAC Address 00 04 AC A4 00 00Interface Description 8271 HW Rev 1; SW 9.1.1 (Rev.A)

System Name Payroll

System Location Bridge 200

System Contact John Smith

DRAM Installed 4 MBFLASH Memory Installed 512 KBTime of Day... Thu. May 9, 1996 10:34:45


Press <CTRL><N> to return to Main Menu.

� �

Figure 4-4. Switch Information Menu

The following list defines information and parameters available on the SwitchInformation panel:

System DescriptionShows the full name and version identification of the system’s hardwaretype.


System IDShows the unique identification code for this 8271 that was assigned atthe factory. It serves a purpose similar to that of a serial number.

MAC AddressDisplays the MAC address of the 8271.

Interface DescriptionShows the hardware and microcode version of the 8271.

System NameDisplays the locally assigned name for this 8271.

System LocationDisplays the locally assigned location for this 8271.

System ContactDisplays the locally assigned contact name for this 8271.

Enhanced FeaturesDisplays the state of the enhanced feature set.

DRAM InstalledDisplays the number of megabytes of memory installed.

Time of DayAllows you to set the internal clock of the 8271.


Configuring Virtual Switch DomainsFrom the Configuration menu, select Virtual Switch Configuration . You canpartition a single 8271 into multiple (up to eight) domains. Each domain acts like aseparate switch. A domain can be configured with its own IP address andmanaged with SNMP. Any domain can participate independently in the spanningtree protocol. Once domains have been established, packets are forwardedbetween ports belonging to the same domain only.

�@ �Virtual Switch Configuration

Return to Previous Menu

Virtual Switch Port Configuration...

Virtual Switch Name Configuration...



� �

Figure 4-5. Virtual Switch Configuration Menu

The following definitions explain the panels you can access from the Virtual SwitchConfiguration menu:

Virtual Switch Port Configuration MenuDisplays the Virtual Switch Port Configuration Menu, which you use toassign ports to domains by choosing from a list of domain names. If youwant to define domain names other than the defaults you must first go to“Naming Virtual Switch Domains” on page 4-15. See “Configuring VirtualSwitch Ports” on page 4-13 for more information.

Virtual Switch Name Configuration MenuDisplays a list of domain names and allows you to change them. See“Naming Virtual Switch Domains” on page 4-15 for more information.


Configuring Virtual Switch PortsFrom the Configuration menu, select Virtual Switch Configuration , and thenselect Virtual Switch Port Configuration... . Use the Change option to assignports to a particular domain.

�@ �

Virtual Switch Port Configuration

Port Domain 1 default 2 default 3 default 4 default 5 default 6 default 7 default 8 default 9 default 10 finance 11 finance 12 default 13 finance 14 development Return More Change

Return to previous menuUse cursor keys to choose item. Press <ENTER> to confirm choice.


� �

Figure 4-6. Virtual Switch Port Configuration Panel (1 of 2)


�@ �Virtual Switch Port Configuration

Port Domain 15 default 16 finance 17 development 21 finance 22 default 23 default 24 default

Return More Change

Display the next page of domain port configuration tableUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-7. Virtual Switch Port Configuration Panel (2 of 2)

The Port column displays the number of the port that you want to assign to adomain (0–7). All ports are initially assigned to domain 0, named “default.”

When you select Change , you are prompted for the port number that is to beassigned to another domain. When you enter the port number, you are presentedwith a list of domain names from which to choose.

Note: For each domain that you establish, you must set up IP parameters, SNMPtrap tables, and spanning tree parameters.


Naming Virtual Switch DomainsFrom the Configuration menu, select Virtual Switch Configuration , and thenselect Virtual Switch Name Configuration... . Use the Change option to createnames for domains by changing those listed. You can create names to assign toDomains 1–7 but the name for Domain 0, “default,” does not appear because itcannot be changed.

�@ �Virtual Switch Name Configuration

Index Name 1 finance 2 development 3 marketing 4 Domain04 5 Domain05 6 Domain06 7 Domain07

Return More Change



� �

Figure 4-8. Virtual Switch Name Configuration Panel


Selecting Virtual Switch Domains to Define ParametersUse the Virtual Switch Domain Selection menu to select which domain to work withwhen defining parameters that exist for each domain such as IP, SNMP, andspanning tree parameters. This menu appears only if more than one domain hasbeen defined. Then, it appears automatically when a menu has been chosen thathas domain-specific parameters such as IP address.

�@ �

Choose a Virtual Switch Name: 1 default 2 Domain01 3 Domain02 4 Domain03 5 Domain04 6 Domain05 7 Domain06 8 Domain07

Use cursor key to move around. press <ENTER> to choose item.

� �

Figure 4-9. Virtual Switch Domain Selection Panel


Configuring IP ParametersFrom the Configuration menu, select IP Configuration... . Move the cursor to theparameter you want to change and enter new parameters. Use the IPConfiguration panel to set the IP address, gateway address, subnet mask, and IPstate, and to send PINGs. The settings take effect when you exit this menu.

�@ �IP Configuration - finance


IP Address 0.0.0.0

Default Gateway 0.0.0.0

Subnet Mask 0.0.0.0

IP State BootP When Needed

IP Packet Type ETHERNET

Send PING



� �

Figure 4-10. IP Configuration Panel

The following list defines parameters displayed on the IP Configuration panel:

IP addresses are always entered as a set of 4 decimal numbers from 0 through255. The numbers must be separated by periods. The default is 0.0.0.0. If thedefault is used, no SNMP management will be available.

IP AddressDisplays the current IP address.

The default IP address is 0.0.0.0.

Default GatewayDisplays the default gateway address.

The default gateway address is 0.0.0.0.

Subnet MaskDisplays the current subnet mask.

The default subnet mask is 0.0.0.0.

IP StateThe choices are IP Disabled, BootP When Needed, and BootP Always.The default is BootP When Needed.


IP DisabledThe domain will not process any IP or Address Resolution Protocol (ARP)frames it receives. It will not respond to SNMP, PING , Telnet, or ARPframes that are received.

BootP When NeededIP is enabled for the domain and will function immediately, if a non-0 IPaddress has been stored in NVRAM. If the IP address is 0 (0.0.0.0),BootP requests will be broadcast by the 8271, in an effort to learn its IPaddress. Until it receives a reply, this is the only IP function that will work.

BootP AlwaysIP is enabled for the domain but will not function until a BootP reply hasbeen received. If a non-0 IP address for the domain is stored in NVRAM,it will be cleared to 0 when the 8271 is booted.

IP Packet TypeDescribes the type of management packets that the switch will receive andtransmit for SNMP, Telnet, BootP, and TFTP. Choices are Ethernet orIEEE 802.3.

Send PINGThe system prompts you to enter an IP address. The 8271 then sends aPING to that address.

BootPWhen you select either of the BootP options above, the 8271 repeats BootPrequests at regular intervals, beginning at 1 second each and eventually decreasingto every 5 minutes until it receives a valid reply. The BootP requests will alsocease if a valid IP address is configured or the IP state is set to IP Disabled.

Once the 8271 stops sending BootP requests on a domain, it does not resumesending requests or recognize BootP responses on that domain unless the 8271 isreset. The parameters in a BootP response that are recognized and recorded inNVRAM are:

¹ IP Address ¹ Default Gateway ¹ Subnet Mask¹ TFTP Bootfile Name¹ TFTP Server Address

Note: See “BootP” on page 7-4 for information on preparing the response file forthe BootP server.


Configuring SNMPFrom the Configuration menu, select SNMP Configuration... . Use the SNMPConfiguration menu to set specific attributes related to SNMP.

�@ � SNMP Configuration


Send Authentication Traps Yes

Community Strings...

Trap Receivers...



� �

Figure 4-11. SNMP Configuration Menu

The following list defines functions and parameters available on the SNMPConfiguration menu.

Send Authentication Failure TrapsIndicates whether an authentication trap should be issued to TrapReceivers whenever authentication of an SNMP request fails. Trapsindicating cold and warm boots are always sent.

The default entry is Yes.

Community Strings MenuAllows you to display and change the list of community names. Tableentries are saved across resets.

Trap Receiver MenuDisplays a table of managers to which to send traps. Entries in the tableare saved across resets and power cycles.


Setting Community Strings ParametersFrom the Configuration menu, select SNMP Configuration... , and thenCommunity Strings... . Use the options at the bottom of the panel to configure thecommunity names for the 8271. A community name is a name associated with the8271 and a set of SNMP Managers allowed to manage it with the specifiedprivilege level. Entries are saved when you exit the menu.

�@ �

Community Strings

Index Community Name Mode 1 public Read 2 management Read/Write

Return Add Entry Delete Entry Change Entry Clear Table



� �

Figure 4-12. Community Strings Panel

The following list defines functions available on the Community Strings panel:

Mode If you select Read, SNMP managers can only view SNMPinformation. If you select Read/Write, SNMP managers can bothview and change SNMP information.

Add Entry Used to add a community name and access mode.

Delete Entry Used to delete a community name.

Change Entry Used to modify a community name or access mode.

Clear Table Used to delete all community names.

Entries are displayed in the order in which they are entered. There is a limit of 10community names.


Setting Trap ReceiversFrom the Configuration menu, select SNMP Configuration... , and then TrapReceivers... . Use the options at the bottom of the panel to tell the 8271 where tosend traps. The table contains the IP address of each SNMP manager, acorresponding community name, and the domain in which the SNMP manager canbe accessed. Entries take effect when you exit the menu.

�@ � Trap Receivers

IP Address Community Name Domain 1 9.67.240.54 management default


Return to previous menuUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-13. Trap Receivers Panel

The following list defines the functions available on the Trap Receivers panel:

Exit Used to return to the previous menu.

Add EntryUsed to add a new entry to the trap receivers panel.

Delete EntryUsed to delete an entry from the trap receivers panel.

Change EntryUsed to modify an entry in the trap receivers panel.

Clear TableUsed to delete all trap receivers panel entries.

The trap receivers panel contains a maximum of six entries. IP addresses arealways entered as a set of 4 decimal numbers, from 0 through 255. The numbersmust be separated by periods.


Configuring Spanning TreeFrom the Configuration menu, select Spanning Tree... . Use the Spanning TreeMenu to specify whether the 8271 is participating in the spanning tree protocol and,if so, to configure spanning tree switch and port parameters. These parameterstake effect when you exit this menu.

�@ �Spanning Tree - finance

Return to Previous MenuParticipate in Spanning Tree No

Switch Priority 32768Switch Hello Time (in Seconds) 2Switch Maximum Message Age (in Seconds) 20Switch Forward Delay (in Seconds) 15

Port Priority...Port Path Cost...Current Spanning Tree Information



� �

Figure 4-14. Spanning Tree Menu

The following list defines parameters and functions available on the Spanning Treepanel:

Participate in Spanning TreeSelect Yes or No. Select Yes to participate in the spanning treeprotocol. If you select No, the remaining values on the menu willbe saved but will have no effect.

The default entry is No.

Switch Priority Enter a priority value for this 8271 in the range of 0 to 65 535(decimal). The lower the priority value, the higher the priority.The bridge or switch with the lowest priority value in a spanningtree becomes the root bridge. (To change individual portpriorities, select the Port Priority menu option.)

The default is 32 768.

Switch Hello Time (in Seconds)When this 8271 is the root switch, Switch Hello Time is the timethe switch waits before sending the next configuration message.

The minimum value is 1.

The maximum value is the lower of 10 or:

[(Switch Maximum Message Age÷2) − 1]


The default is 2.

The valid range for this parameter is displayed when you selectSwitch Hello Time.

Switch Maximum Message Age (in Seconds)Enter the maximum message age used when this 8271 is the rootswitch. This parameter limits the amount of time the switchallows a frame to stay on the network.

The minimum value is the higher of 6 or:

[2 x (Switch Hello Time) + 1)]

The maximum cannot be more than the lower of 40 or:

[2 x (Switch Forward Delay − 1)]

The default is 20.

The range limits that appear when you select this parameter arecalculated using the values currently selected for Switch HelloTime and Switch Forward Delay.

Switch Forward Delay (in Seconds)Enter the time the 8271 waits between transitions from listeningto learning, and from learning to forwarding.

The minimum is the larger of 4 or:

[Switch Maximum Message Age÷2 + 1]

The maximum is 30.

The default is 15.

The lower range limit that appears when you select thisparameter reflects the value currently selected for SwitchMaximum Age.

Port Priority MenuDisplays a list of port priorities. This menu is active only whenthe Participate in Spanning Tree option is set to Yes. See“Setting Port Priority” on page 4-24 for more information.

Port Path Cost MenuDisplays a list of port path costs. This menu is active only whenthe Participate in Spanning Tree option is set to Yes. See“Setting Port Path Cost” on page 4-26 for more information.

Current Spanning Tree InformationDisplays the 8271’s view of the current spanning tree. This menuis active only when the Participate in Spanning Tree option is setto Yes. See “Viewing Current Spanning Tree Information” onpage 4-28 for more information.


Setting Port PriorityFrom the Configuration menu, select Spanning Tree... , and then Port Priority... .Use the Port Priority panel to view and change spanning tree priorities for eachport.

�@ � Port Priority

Port Priority 1 128 2 128 3 128 4 128 5 128 6 128 7 128 8 128 9 128 10 128 11 128 12 128 13 128 14 128 Return More Change



� �

Figure 4-15. Port Priority Panel (1 of 2)


�@ � Port Priority

Port Priority 15 128 16 128 17 128 21 128 22 128 23 128 24 128

Return More Change



� �

Figure 4-16. Port Priority Panel (2 of 2)

Select the port whose priority value you want to change, press Enter , and thenenter the new value.

Note: The port with the lowest priority value has the highest priority and willforward the spanning tree frames.

The possible range is 0 through 255 (decimal).

The default is 128. If all ports have the same priority value, the lowest port numberforwards the spanning tree frames.


Setting Port Path CostFrom the Configuration menu, select Spanning Tree... , and then Port Path Cost... .Use the Port Path Cost panel to view and change the spanning tree path costassociated with each port. The spanning tree uses port path costs to determinewhich port to select as a forwarding port.

�@ �Port Path Cost

Port Cost 1 100 2 100 3 100 4 100 5 100 6 100 7 100 8 100 9 100 10 100 11 100 12 100 13 100 14 100 Return More Change

Display next page of Port Priority TableUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-17. Port Path Cost Panel (1 of 2)


�@ �Port Path Cost

Port Cost 15 100 16 100 17 100 21 10 22 100 23 100 24 100

Return More Change

Display next page of Port Path Cost TableUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-18. Port Path Cost Panel (2 of 2)

Select the port whose cost you want to change, press Enter , and then enter a newvalue. When the spanning tree reconfigures itself, it selects forwarding ports basedon the port cost. Therefore, assign lower numbers to ports attached to fastermedia (such as FDX Ethernet or EtherPipe), and higher numbers to ports attachedto slower media (such as 2400-baud modem links). The possible range is 0 to65 535. The default is 100. The recommended path cost is:

Path Cost = 1000÷LAN speed in Mbps


Viewing Current Spanning Tree InformationFrom the Configuration menu, select Spanning Tree... , and then CurrentSpanning Tree Information... . Use the Current Spanning Tree Information panelto view a summary of all spanning tree information for each port. You can onlyview the information on this panel.

�@ �Current Spanning Tree Information - Domain01

Hello Time: 2, Max Message Age: 20, Forward Delay: 15Root: 34463.08005A9100A0, Root Port: This Switch is Root

Port Port Port Desig Designated Desig #Topo Time SinceID Cost STS Cost Switch/Bridge ID PortID Chgs Last Change

-----------------------------------------------------------------------128.01 100 FWD 0 34463.08005A9100A0 128.01 1 0:18:57128.02 100 FWD 0 34463.08005A9100A0 128.02 1 0:18:57128.03 100 FWD 0 34463.08005A9100A0 128.03 1 0:18:57128.04 100 FWD 0 34463.08005A9100A0 128.04 1 0:18:57128.05 100 FWD 0 34463.08005A9100A0 128.05 1 0:18:57128.06 100 FWD 0 34463.08005A9100A0 128.06 1 0:18:57128.07 100 FWD 0 34463.08005A9100A0 128.07 1 0:18:57128.08 100 FWD 0 34463.08005A9100A0 128.08 1 0:18:57

Return

Configure Spanning Tree and port parametersUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-19. Current Spanning Tree Information Panel

The following list defines the information available on this panel:

Hello TimeDisplays the Hello Time, in seconds, that is advertised by the root andused by all devices and switches in the active topology of the spanningtree network.

Max Message AgeDisplays the Maximum Message Age, in seconds, that is advertised by theroot and used by all devices and switches in the spanning tree network.

Forward DelayDisplays the Forward Delay Time, in seconds, that is advertised by theroot and used by all devices and switches in the spanning tree network.

Root Displays the priority and MAC address of the device in the spanning treethat this switch has accepted as the root device.

Root PortDisplays the number of the port on this switch that is closest to the root.This switch communicates with the root through this port. If there is noroot port, this switch has been accepted as the root of the spanning treenetwork.

Port ID Displays the port ID that is used to determine the role of the port in thespanning tree. The port ID is expressed in the form <port priority>.<portnumber>.


Port CostDisplays the Port Path Cost for each port on the switch. The Port PathCost helps determine the role of the port in the spanning tree.

Port STS (Status)Displays the current status of this port within the spanning tree:

DSB Disabled

BLK Blocked

LSN Listening

LRN Learning

FWD Forwarding

The rules that define the state of the port are as follows:

¹ A port on a network segment with no other switch or bridge is alwaysforwarding.

¹ If two ports of the 8271 are connected to the same network segmentand there is no other bridge or switch, the port with the smaller ID isforwarded and the other is blocked.

¹ When the switch is booted, all ports are blocked initially, and thensome of them change to a different state: listening, learning, andforwarding, in that order. To see the change in states you mustrepeatedly exit from this menu, and then select it again. All ports thatare going to change states from blocking to forwarding will have doneso after two to three times the value of:

[Switch Maximum Message Age + (2 × Switch Forward Delay)]

Designated CostDisplays the cost for a packet to travel from this port to the root in thecurrent spanning tree configuration. The slower the media, the higher thecost.

Designated Switch/Bridge IDDisplays the priority and MAC address of the device through which thisport has determined it must communicate with the root of the spanningtree.

Designated Port IDDisplays the port on the designated bridge through which this switch willcommunicate with the root of the spanning tree. This information is usefulif the 8271 is the designated bridge on one or more network segments.

# Topo ChangesDisplays the number of topology changes, that is, the number of times theport has entered the forwarding state plus the number of times the porthas made the transition from forwarding to blocking. The counter is resetwhen the switch is reset or the spanning tree is turned on.

Time Since Last ChangeDisplays the time since the last time that the port entered the forwardingstate or made the transition from forwarding to blocking.


Viewing Port ConfigurationFrom the Configuration menu, select Port Configuration... . Use the PortConfiguration panel to enable or disable a specific port. In addition, you can use itto change the communication mode (half- or full-duplex) for each port.

�@ � Port Configuration

Port Type Link MDI/MDI-X Speed Mode Duplex Enabled/Disabled 1 AUI up MDI-X 10 A-CT Full Enabled

2 10BaseT down MDI-X 10 A-CT Full Enabled3 10BaseT down MDI-X 10 A-CT Half Enabled4 10BaseT down MDI-X 10 A-CT Full Enabled5 10BaseT down MDI-X 10 A-CT Full Enabled6 10BaseT down MDI-X 10 A-CT Full Enabled7 10BaseT down MDI-X 10 A-CT Full Enabled8 10BaseT down MDI-X 10 A-CT Full Enabled9 10BaseT up MDI-X 10 A-CT Full Enabled

10 10BaseT up MDI-X 10 A-CT Full Enabled 11 10BaseT up MDI-X 10 A-CT Full Enabled 12 10BaseT up MDI-X 10 A-CT Full Enabled 13 10BaseT up MDI-X 10 A-CT Half Enabled 14 10BaseT up MDI-X 10 A-CT Half Enabled Return More Change



� �

Figure 4-20. Port Configuration Panel (1 of 2)


�@ � Port Configuration

Port Type Link MDI/MDI-X Speed Mode Duplex Enabled/Disabled 15 10BaseT up MDI-X 10 A-CT Half Enabled 16 10BaseT up N/A 10 A-CT Half Enabled 17 100BaseFx down 100 A-SF Half Enabled

21 10BaseT down MDI-X 10 A-CT Half Enabled22 10BaseT down MDI-X 10 A-CT Half Enabled23 10BaseT down MDI-X 10 A-CT Half Enabled24 10BaseT down MDI-X 10 A-CT Half Enabled

Return More Change

Display the next page of port configuration tableUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-21. Port Configuration Panel (2 of 2)

The following list defines the parameters and functions available on the PortConfiguration panel:

Type Displays the port type. For Model 108, Ports 2 through 8 are 10BASE-T;for Model 216, Ports 2 through 16 are 10BASE-T. Port 1 can be eitherAUI or 10BASE-T.

If a UFC is installed in Model 108, each of its ports and port types will belisted here starting at port 9.

For Model 216, the following port numbers apply:

¹ UFC slot 1 reserves ports 17 through 20.

¹ UFC slot 2 reserves ports 21 through 24.

Note: If a one port UFC is inserted in slot 2, the following ports wouldexist: 1 through 15, 21.

Link Indicates whether the port is up or down.

MDI/MDI-XIndicates whether the port is media dependant interface (MDI) or mediadependant interface crossed (MDI-X). For Model 108, ports 1–7 arealways MDI-X; port 8 is switchable. For Model 216, ports 1–15 arealways MDI-X; you choose the type of port, MDI-X or MDI, for port 16.

Speed Displays the speed of the port in Mbps.

Mode Indicates the switching mode of the port. See “Viewing or Changing PortSwitching Mode” on page 4-47.


Duplex Displays and allows you to change the setting of duplex mode for the port.The default is half. Changes to the duplex settings are made immediatelyby the 8271

Enabled/DisabledDisplays and allows you to change the operational status of the ports. Anasterisk (*) indicates that a change has been made during the currentpanel session. The default is Enabled.

Viewing the Module Information PanelFrom the Configuration menu, select Module Information... . The ModuleInformation panel displays information about installed UFCs.

�@ � Module Information

Module Status Model Revision Ports Up Time 1 up 8271 1 16 27:27:57

2 up 100F 0 1 27:27:573 up 10T 11 4 27:27:57

Return



� �

Figure 4-22. Module Information Menu

The following list defines information available on the Module Information panel:

Module Displays module number. The 8271 is listed as Module 1. An installedUFC will appear as Module 2.

Status Indicates whether the module is up or down.

Type Indicates the type of module or UFC.

RevisionDisplays the revision level of the module.

Ports Indicates the number of ports on the module.

Up TimeDisplays how long the module has been up.


Configuring EtherProbeFrom the Configuration menu, select EtherProbe... . From the EtherProbeConfiguration panel, select the port to monitor with the Probe port. You can alsoselect which traffic to probe.

�@ � EtherProbe Configuration


EtherProbe Port Number 0

Traffic to Probe None



� �

Figure 4-23. EtherProbe Configuration Panel

The following list defines functions available on the EtherProbe Configuration panel:

EtherProbe Port NumberAllows you to select the 10BASE Ethernet port that will be monitored bythe Probe port. Select port 0 to disable the Probe port.

Traffic to ProbeAllows you to select to monitor transmit or receive if the port is an FDXport. Both transmit and receive are provided if the port is HDX. If theProbe port is not in use, “None” will be displayed.


EtherPipe ConfigurationFrom the Configuration menu, select EtherPipe . Use the EtherPipe menu tochoose to configure EtherPipe or obtain information on active EtherPipes.

�@ � EtherPipe


EtherPipe Configuration...

Running EtherPipe Information...



� �

Figure 4-24. EtherPipe Menu

The following list describes functions available from the EtherPipe menu:

EtherPipe ConfigurationDisplays the EtherPipe Configuration Menu.

Running EtherPipe InformationDisplays the status of the configured EtherPipes.


Configuring EtherPipesFrom the Configuration menu, select EtherPipe , and then EtherPipeConfiguration... . Use the EtherPipe configuration panel to add, delete, andchange EtherPipes. EtherPipes consist of two to four channels (port connections).A single EtherPipe can consist of a combination of HDX and FDX connections; forexample, an EtherPipe containing three ports can have one HDX and two FDXconnections. However, both ports in each interconnected pair must be either HDXor FDX. In addition, all ports in a single EtherPipe must belong to the samedomain on the 8271.

�@ �

EtherPipe

EtherPipe Ports 1 1 2 2 not defined 3 not defined 4 not defined




� �

Figure 4-25. EtherPipe Configuration Panel

The following list defines functions available on the EtherPipe panel:

Add EntryUsed to select the 2–4 port numbers for an EtherPipe to be established.The port numbers are entered from lowest to highest, separated byspaces.

Notes:

1. You must define the EtherPipes for both connected 8271s beforephysically connecting the linked ports. Make sure that you have eitherdisabled the ports or disconnected the cables before you configureEtherPipes on the 8271s, or you will create loops.

2. When you physically connect the linked ports, make sure that theports with the lowest port numbers are connected together, the portswith the next-lowest port numbers are connected to each other, and soforth. For example, if an EtherPipe links ports 3, 6, and 7 of one 8271and ports 2, 4, and 5 of another 8271, the ports must be connected to


each other in the following manner: port 3 to port 2, port 6 to port 4,and port 7 to port 5.

Delete EntryUsed to delete a selected EtherPipe.

Change EntryUsed to reenter port numbers in a selected EtherPipe. The port numbersare entered from lowest to highest, separated by spaces.

Note: The ports must be disabled or disconnected before you change anEtherPipe.

Clear TableUsed to delete all EtherPipes.

Viewing the Running EtherPipe Information PanelFrom the Configuration menu, select EtherPipe , and then Running EtherPipeInformation... . Use the Running EtherPipe Information panel to display informationabout active EtherPipes.

�@ �Running EtherPipe Information

EtherPipe State Ports 1 Up 1 2

Return



� �

Figure 4-26. Running EtherPipe Information Menu

The following list describes the information available on the Running EtherPipepanel:

EtherPipeShows the EtherPipe number.

State Indicates whether the EtherPipe is up or down.

Ports Shows the ports assigned to the EtherPipe.


Configuring the MAC Filter & Port Security:

From the Configuration menu, select MAC Filter & Port Security... . Use the MACFilter & Port Security menu to configure MAC address filters, configure port securityattributes, or view port filters.

�@ �MAC Filter & Port Security


Configure Filters...

Configure Port Security Mode...

View Port Filters...



� �

Figure 4-27. MAC Filter & Port Security Menu

The following list defines the options available from this menu:

Configure FiltersUsed to configure MAC address filters.

Configure Port Security ModeUsed to specify the security attributes of a port.

View Port FiltersDisplays the filtered MAC addresses and the ports that use them. Port 0refers to the 8271 system module.


Configuring MAC FiltersFrom the Configuration menu, select MAC Filter & Port Security , and thenConfigure Filters... . Use the Configure Filters panel to restrict certain users fromcommunicating with other users by specifying up to 100 source or destination MACaddresses to be filtered at the port of entry into the 8271. MAC addresses can beunicast, multicast, or broadcast. All 100 addresses can be associated with one portor divided among all ports.

�@ � Configure Filters

Index MAC Address Type Applied Ports Exit Ports 1 10005A 4315CF src 4

Filter Type:Block any packet with Source AddressBlock any packet with Destination AddressAllow any packet with the designated Source address to port(s)....Force any packet with the designated Destination Address to port(s)....

Please enter the MAC address (xx xx xx xx xx xx): 01 04 27 99 01 04

Please enter the port(s) to apply this filter:

Null input causes the filter to be applied to all ports.

Return Zoom More Add Entry Delete Entry Clear Table

Press <ESC> to cancel. Press <ENTER> to confirm choice.Press <CTRL><N> to return to Main Menu.

� �

Figure 4-28. Filter Configuration Menu

The following list defines functions available from this panel:

Add EntryUsed to specify the filter type, the MAC address you want to filter, and theports to which this filter will be applied.

Delete EntryUsed to specify a filter you want to remove.

Clear TableClears the address table.

Zoom Displays the complete list of Applied and Exit ports for the filter.

Filter Type

Block any packet with Source Address Listed as src in the Type field.

Block any packet with Destination Address Listed as dst in the Type field.

Allow any packet with the designated Source address to ports Listed as src inthe Type field.


Force any packet with the designated Destination Address to ports Listed asdst in the Type field.

When you choose any of the Filter Type options, you are prompted to enter theport to which the filter applies. This is the port where the filtering takes place.After you have entered it, this port number appears in the Applied Ports column.

When you choose “Allow any packet with the designated Source address to ports”or “Force any packet with the designated Destination Address to ports,” you arealso prompted to enter the port that is to receive the filtered data. This portappears in the Exit Ports column.

Notes:

1. If you set up a filter for broadcast packets, hosts on the other side of the 8271will not see the ARP broadcast packets. To prevent this, let the 8271 learn thehost addresses before implementing the filter. Some hosts might time out theirlocal address entries and attempt to relearn them with a broadcast ARP.

2. If a filter is set up with the EtherPipe option, filters must be created for all portsin the EtherPipe.


Configuring Port Security ModeFrom the Configuration menu, select MAC Filter & Port Security , and thenConfigure Port Security Mode . Use the Configure Port Security Mode panel todefine the security attributes of each port. This function totally blocks (secures)specific address types at selected ports. Addresses that have been allowed orforced by a configured filter are not blocked.

�@ �

Configure Port Security Mode

Port Security Mode 1 Normal 2 Normal 3 Normal 4 Normal 5 Normal 6 Normal 7 Normal 8 Normal 9 Normal 10 Normal 11 Normal 12 Normal 13 Normal 14 Normal Return More Change



� �

Figure 4-29. Configure Port Security Mode (1 of 2)


�@ �Configure Port Security Mode

Port Security Mode 15 Normal 16 Normal 17 Normal 21 Normal 22 Normal 23 Normal 24 Normal

Return More Change

Display the next page of port security attributesUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-30. Configure Port Security Mode (2 of 2)

The following list defines functions available on this panel:

Normal No security mode is defined for a port. This is the default.

Secure source addressesBlock all source addresses, except those allowed by a configured filter.

Secure destination addressesBlock all destination addresses, except those forced by a configured filter.

Secure both source and destination addressesBlock all source and destination addresses, except those allowed or forcedby a configured filter.


Viewing Port FiltersFrom the Configuration menu, select MAC Filter & Port Security... . Then, selectView Port Filters... . Use the View Port Filters panel to display the defined filtersand security mode for the specified port.

�@ �

Port 1 View Port Filters

Index MAC Address Description1 10005A 4315CF This address is blocked

Return More

Port 1 Security Mode: Secure destination addresses



� �

Figure 4-31. View Port Filters Panel


Configuring Address AgingFrom the Configuration menu, select Address Aging... . Use the Address Agingmenu to configure Port or Master address table aging.

�@ � Address Aging


Port Address Table Aging...

Master Address Table Aging...



� �

Figure 4-32. Address Aging Menu

The following list defines functions available on the Address Aging panel:

Port Address Table AgingUsed to configure the aging time and level for each port.

Master Address Table AgingUsed to configure aging time and level for the 8271.


Viewing or Changing Port Address Table AgingFrom the Configuration menu, select Address Aging... , and then Port AddressTable Aging... . Use the Port Address Table Aging panel to change the aging timeand level from the defaults for each port.

�@ �Port Address Table Aging

Port Aging Time (min.) Demand Aging Level 1 15 90% 2 15 90% 3 15 90% 4 15 90% 5 15 90% 6 15 90% 7 15 90% 8 15 90% 9 15 90% 10 15 90% 11 15 90% 12 15 90% 13 15 90% 14 15 90% Return More Change



� �

Figure 4-33. Port Address Table Aging Panel (1 of 2)


�@ �

Port Address Table Aging

Port Aging Time (min.) Demand Aging Level 15 15 90% 16 15 90% 17 15 50% 21 15 50% 22 15 50% 23 15 50% 24 15 50%

Return More Change

Display the next page of port address aging tableUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-34. Port Address Table Aging Panel (2 of 2)

The following list defines the information available on the Port Address Table Agingpanel:

Aging TimeDefines the time an inactive MAC address will remain in the Port AddressTable after the Demand Aging Level is reached. The default is 15minutes. A value of 0 will disable the removal of addresses based on age.

Demand Aging LevelDefines how full the Port Address Table must be in order for addresses tobe purged. The default is 90%. A value of 0 will disable the removal ofaddresses when the threshold has been reached.


Viewing or Changing Master Address Table AgingFrom the Configuration Menu, select Address Aging... , and then Master AddressTable Aging... . Use the Master Address Table Aging panel to define the agingtime and level for the 8271.

�@ �Master Address Table Aging

Return

Aging Time 15 minutes

Demand Aging Level 90%

Modify address aging interval for master address table (0 means disable)Use cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-35. Master Address Table Aging Panel

The following list defines the information available on the Master Address TableAging panel:

Aging TimeDefines the time an inactive MAC address will remain in the MasterAddress Table after the Demand Aging Level is reached. The default is15 minutes. A value of 0 will disable the removal of addresses based onage.

Demand Aging LevelDefines how full the Master Address Table must be in order for addressesto be cleared. When the threshold is reached, the addresses are clearedbased on a random algorithm that is weighted to clear remote addressesfirst. The default is 90%. A value of 0 will disable the removal ofaddresses when the threshold has been reached.


Viewing or Changing Port Switching ModeFrom the Configuration menu, select Port Switching Mode... Use the PortSwitching Mode panel to change the port switching mode, error watermark, andrunt-free mode.

�@ �Port Switching Mode

Port Switching Mode Error Watermark Runt-free Mode 1 Auto 50% off 2 Auto 50% off 3 Auto 50% off 4 Auto 50% off 5 Auto 50% off 6 Auto 50% off 7 Auto 50% off 8 Auto 50% off 9 Auto 50% off 10 Auto 50% off 11 Auto 50% off 12 Auto 50% off 13 Auto 50% off 14 Auto 50% off Return More Change



� �

Figure 4-36. Port Switching Mode Panel (1 of 2)


�@ �

Port Switching Mode

Port Switching Mode Error Water Mark Runt-free Mode 15 Auto 50% off 16 Auto 50% off 17 Auto 50% off 21 Auto 50% off 22 Auto 50% off 23 Auto 50% off 24 Auto 50% off

Return More Change

Display the next page of switching mode water marksUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-37. Port Switching Mode Panel (2 of 2)

The following list explains the information available on the Port Switching Modepanel:

Cut-Through ModeThe highest-speed switching mode.

Store-and-Forward ModeThe mode that provides improved error isolation at the expense of somespeed.

Auto (Adaptive) ModeThe 8271 will automatically alternate between cut-through andstore-and-forward mode based on the specified error watermark. It willoperate in cut-through mode until the ratio of error packets to total packetsreaches the percentage specified in the error watermark. Then, the 8271changes to store-and-forward mode. It will change back to cut-throughmode when the percentage of error packets falls 5% below the errorwatermark. Auto mode is also called adaptive mode.

The default switching mode is Auto.

Error WatermarkThe threshold at which the 8271 switches from cut-through tostore-and-forward mode. It is expressed as a percentage and iscalculated by dividing the number of error packets received by the totalnumber of packets. The error watermark is applicable in Auto mode only.The default is 50%.


Runt-Free ModeTurning on Runt-Free Mode stops the 8271 from forwarding packets offewer than 64 bytes. The default is off.

Broadcast SuppressionProvides the ability to suppress all broadcast packets from a port if the rate ofbroadcast packets exceeds a specified (user-defined) threshold. Broadcast packetsare allowed from that port once the rate of packets falls below the user-definedthreshold.

�@ � Broadcast Suppression

Port Broadcast Suppression Broadcast Water Mark 1 off 2 off 3 off 4 off 5 off 6 off 7 off 8 off 9 off 10 off 11 off 12 off 13 off 14 off Return More Change



� �

Figure 4-38. Broadcast Suppression Panel (1 of 2)


�@ �

Broadcast Suppression

Port Broadcast Suppression Broadcast Water Mark 15 off 16 off 17 off 21 off 22 off 23 off 24 off

Return More Change

Display the next page of broadcast suppression parametersUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 4-39. Broadcast Suppression Panel (2 of 2)

The following list defines functions available on the Broadcast Suppression panel:

Broadcast SuppressionUsed to enable or disable broadcast suppression. The default is off (nobroadcast suppression).

Broadcast Water MarkEstablishes the broadcast suppression threshold.


Configuring and Changing the PasswordFrom the Configuration menu, select Password... . Use the Password menu toadd, change, or delete a password. If you establish a password, users must enterit to obtain access to the Main Menu.

�@ �

Password


Set Password

Delete Password

Change or add a passwordUse cursor keys to choose item. Press <ENTER> to confirm choice.


� �

Figure 4-40. Password Panel

The following list defines functions available on the Password panel:

Set PasswordUsed to establish or change the password. The default is no password.

Delete PasswordUsed to delete the password.

The system prompts you to enter the password before it allows you to change ordelete the password. If you are establishing a new password, press Enter at theOld Password prompt.

Note: The password is case sensitive.

The password is saved across resets and power cycles.

Note: If you have forgotten your password, press the System Request button toaccess the System Request Menu, and then Clear NVRAM. This will clear thepassword, but also set all configuration parameters to their default value, clearingany data you have entered.


Configuring the ConsoleFrom the Configuration menu, select Console Configuration... . Use the ConsoleConfiguration menu to configure for a serial link or Telnet console session and toset the console time-out value.

�@ � Console Configuration


Serial Link Configuration...

Telnet Configuration...

Console Time-Out 5



� �

Figure 4-41. Console Configuration Menu

The following list defines functions available on the Console Configuration menu:

Serial Link ConfigurationUsed to configure a console session with a device attached to the EIA 232port.

Telnet ConfigurationUsed to configure a console session via Telnet.

Console Time-OutUsed to set the number of minutes a console session will remain idlebefore timing out. Unsaved screen entries are lost when the consoletimes out.


Configuring Serial Link for the ConsoleFrom the Configuration menu, select Console Configuration... , and then SerialLink Configuration... . Use the Serial Link Configuration panel to change thedefault parameters of the EIA 232 port, if necessary, to set up a console sessionwith an attached device.

�@ �Serial Link Configuration


Hardware Flow Control Disabled

Software Flow Control Disabled

Autobaud upon Break Disabled

Console Baud Rate 19200



� �

Figure 4-42. Serial Link Configuration Panel

The following list defines functions available on the Serial Link Configuration panel:

Hardware Flow ControlUsed to enable or disable hardware flow control. The default is Disabled.

Software Flow ControlUsed to enable or disable software flow control. The default is Disabled.

Autobaud upon BreakUsed to enable or disable autobaud upon break. The default is Enabled.When set to Enabled, a baud rate change can be accomplished bychanging the baud rate of the terminal emulator, disconnecting andreconnecting the EIA 232 cable, and then pressing enter until a panelappears.

Console Baud RateUsed to display and change the 8271 EIA 232 port baud rate.

Acceptable baud rates for the console are 1200, 2400, 4800, 9600,19 200, 38 400, or Autobaud.

The default value for this parameter is 9600.

Make sure that your terminal emulator baud rate matches the consolebaud rate you set.


Configuring Telnet for a Console SessionFrom the Configuration menu, select Console Configuration... , and then TelnetConfiguration... . Use the Telnet Configuration panel to configure the 8271 for aTelnet console session.

�@ � Telnet Configuration


Number of Telnet Sessions Allowed 5

Disallow New Telnet Session No

Terminate All Active Telnet Sessions

Telnet Sessions...



� �

Figure 4-43. Telnet Configuration Menu

The following list defines information and functions available on the TelnetConfiguration panel:

Number of Telnet Sessions AllowedDefines the number of Telnet sessions allowed. The default is 5.

Disallow New Telnet SessionsDisallows new Telnet sessions. The default is No.

Terminate All Active Telnet SessionsAll active Telnet sessions are stopped.

Telnet SessionsDisplays any active Telnet sessions.


Viewing or Closing Active Telnet SessionsFrom the Configuration menu, select Console Configuration... , and then TelnetConfiguration... . Select Telnet Sessions... . Use the Telnet Sessions panel toview or close any active Telnet sessions.

�@ � Telnet Sessions

--- Remote --- --- Local ---Index Box IP Port IP Port Status

Return Close Session

No active Telnet session. Press any key to continue...Return to previous menu

Use cursor keys to choose item. Press <ENTER> to confirm choice.Press <CTRL><N> to return to Main Menu.

� �

Figure 4-44. Telnet Sessions Panel

Resetting the 8271Resetting the 8271 will interrupt all network traffic through the 8271.

Depending on whether you want to reset the 8271 with diagnostics (a cold boot) orwithout diagnostics (a warm boot), perform one of the following steps:

¹ Disconnect the power cord from the 8271 and then reconnect it. This will resetthe switch and start system self-diagnostics.

¹ Press the Reset button on the front panel of the 8271. The 8271 will be reset,but it will not perform system self-diagnostics.

¹ From the Main Menu, select Reset... (see Figure 4-2 on page 4-7) to resetthe switch either with or without system self-diagnostics.

Note: LED indications that show the result of diagnostic tests are not given in realtime. You must reset the switch with diagnostics in order to determine whether theLEDs are alerting you to a problem with the 8271.


Reset MenuFrom the Main Menu, select Reset... . Use the Reset menu to reset the 8271 andto download the microcode.

�@ � Reset


Number of Resets Since Diagnostics 0

Reset Switch with Diagnostics

Reset Switch without Diagnostics

Reset Port Address Table

Clear Non-Volatile RAM

Power-On Diagnostics Enabled



� �

Figure 4-45. Reset Menu

The following list defines information and functions available on the Reset menu:

Number of Resets since DiagnosticsDisplays the number of times the unit has been reset since the unit waspowered on or ran power-on diagnostics. This number is not reset to 0when you reset the address table for the port.

Reset Switch with DiagnosticsResets the 8271 hardware, runs diagnostic tests, clears all countersincluding address tables, and starts the 8271. This does not clear anyuser-configured parameters. When the 8271 restarts, parameters fromNVRAM are used to initiate the operational parameters.

Reset Switch without DiagnosticsResets the switch hardware, clears all counters including address tables,and starts the 8271. This does not clear any user-configured parameters.When the 8271 restarts, parameters from NVRAM are used to initiateoperational parameters.

Reset Port Address TableAllows you to select all ports or individual ports in order to clear tableentries, set all port traffic counters to 0, and set Time since Last Reset to0.


Clear Non-Volatile RAMDeletes all user-configured parameters, such as IP address and baud rateinformation, and resets the 8271.

Note: Clearing NVRAM erases all configuration parameters. If you areusing the EtherPipe feature, be sure to disconnect the affected ports ordisable them on the Port Configuration Menu and reset the switch beforeclearing NVRAM. If you are using the spanning tree option, it will beturned off and port costs and priorities will be lost, which can result inloops. Use the menus to reestablish port costs and priorities. If you areusing an SNMP manager, reconfigure all IP and SNMP parameters.

Power-On DiagnosticsEnables or disables the running of power-on diagnostics when the 8271 ispowered on. The default is Enabled.

If the 8271 is connected to a terminal via the EIA 232 port, the diagnosticmessages shown in Figure 4-46 should appear after you reset the 8271 withdiagnostics. An abbreviated version of these messages will appear if you reset the8271 without diagnostics.

�@ �IBM Nways System Software Version 9.1.1 (Rev.A), Copyright 1994, 1995,.System started on Fri. May 10, 1996 14:31:354 Megabytes System memory2 Megabytes Network memory- Initialization started- File system initialized- System temperature is within safe operating levels- Warmboot initialization started- Checking file system integrity- LAN ports detected:- 10Base-T : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16- 100Base-F : 17- 10Base-T : 21 22 23 24

- Initializing Ports: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 21 22 23 24- Initializing system address table- No existing diagnostic information, forcing diagnostic mode- Starting Power Up Diagnostics test- UART loopback test on diagnostic port...Passed- UART loopback test on console port...Passed- RTC memory test...Passed- Real Time Clock test...Passed- CPU loopback test..............Passed- Ethernet Port loopback test.......................Passed- Ethernet Port fast transmit loopback test.......................Passed- Ethernet Port fast receive loopback test.......................Passed- Ethernet Port cross port loopback test.......................Passed- Ethernet Port broadcast test.......................Passed- 100Base loopback test....Passed- 100Base cross port loopback test....Passed- 100Base port broadcast test....Passed- CPU broadcast test...Passed

- Completed Power Up Diagnostics testNways Switch initiating bootp requests on one or more domains- System initialization complete- Enabling port: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 21 22 23 24

Press RETURN key to activate console...� �

Figure 4-46. Messages during Diagnostics


Chapter 5. Using the Statistics Panels

This chapter provides information about monitoring the 8271 via the consoleinterface. Before proceeding with the information in this chapter, make sure thatyou have performed the following steps:

¹ Attach a PC or other DTE device to the EIA 232 port on the 8271 by followingthe steps under “Connecting a Local Terminal” on page 4-4 or “Connecting aModem to Allow Remote Terminal Access” on page 4-5.

¹ At the main menu (see “Beginning the Console Session” on page 4-6), usethe arrow keys to go to Statistics... and Press Enter . This brings up theStatistics menu, from which you can view 8271 statistics.

Viewing StatisticsUse the statistics information panels to view statistics for the system as a whole orfor individual ports. You cannot change the information that appears on statisticspanels. To view the Statistics Menu, select Statistics... from the Main Menu.

�@ � Statistics

Return to Previous Menu Switch Statistics... Port Statistics... Address Tables...

Spanning Tree Bridge Information...Current Spanning Tree Information...Virtual Switch Statistics...IEEE 802.3 Statistics...Diagnostic Test Results...Message Log Information...

Display information about switch utilizationUse cursor keys to choose item. Press <ENTER> to confirm choice.


� �

Figure 5-1. Statistics Menu

The following list describes the panels available from the Statistics menu:

Switch Statistics MenuDisplays information about switch utilization. See “Viewing SwitchStatistics” on page 5-2 for more information.


Port Statistics MenuDisplays information about a particular port. See “Viewing Port NStatistics” on page 5-4 for more information.

Address Tables MenuDisplays the port selection for port and system address tables. See“Viewing Address Tables” on page 5-5 for more information.

Spanning Tree Bridge InformationDisplays spanning tree information used only when this switch is the root.See “Viewing the Spanning Tree Bridge Information” on page 5-9 for moreinformation.

Current Spanning Tree InformationDisplays the 8271’s view of the current spanning tree. See “ViewingCurrent Spanning Tree Information” on page 5-10 for more information.

Virtual Switch StatisticsDisplays the selection for separate domain statistics. See “Viewing VirtualSwitch Statistics” on page 5-12 for more information.

IEEE 802.3 Statistics MenuDisplays the IEEE 802.3 statistics. See “Viewing IEEE 802.3 Statistics” onpage 5-13 for more information.

Diagnostic Test ResultsProvides the ability to display the results of diagnostic tests and any errorsthat might have occurred during power-up diagnostics. See “DiagnosticTest Results” on page 5-13 for more information.

Message Log InformationProvides the ability to display any message recorded by the system(ER_Error_log function). See “Message Log Information” on page 5-13 formore information.

Viewing Switch StatisticsFrom the Statistics menu, select Switch Statistics... . The Switch Statistics paneldisplays information about stations connected to the 8271.


�@ � Switch Statistics

Return to Previous MenuSystem Up Time 2 Hr, 1 Min, 47 Sec

Board Temperature NormalCurrently Active Stations 58Largest Number of Stations 58Maximum Number of Stations 10000

Buffer Overruns 0 Software Frames 0

Error Frames Received 0 Frames Lost 0 Short Frames 0 Oversize Frames 0

Bad Entry Port Frames 0Pending Send Requests 0

Dropped Frames 0Maximum Hash Chain 3Hash Table Full 0

Reset Statistics

Return to previous menuPress <ENTER> to exit menu.


� �

Figure 5-2. Switch Statistics Panel

The following list defines information available on the Switch Statistics panel:

System Up TimeDisplays the length of time since the last reset or power cycle.

Currently Active StationsDisplays the number of entries in the address table, representing thenumber of currently active stations, or nodes, on all ports of the 8271.

Largest Number of StationsDisplays the most stations ever active on all ports at one time since thelast reset or power cycle.

Maximum Number of StationsDisplays the maximum number of stations that the 8271 can supportsimultaneously. This is different from the Maximum Number of Stationsvalue that appears in the Port Statistics menu, which is the number ofaddresses for a specific port.

Chapter 5. Using the Statistics Panels 5-3

Viewing Port N StatisticsFrom the Statistics menu, select Port Statistics... . The Port N Statistics paneldisplays detailed information about a particular port N, where N is the number ofthe port, in the range of 1 to 24.

�@ �Port 1 Statistics

Return to Previous MenuLocal Frames Received 0Frames Switched by Hardware 0All Forwarded Frames 0Number of Learned Stations 0Frames Delivered for Learning 0Broadcast Frames Received 0Local Address Entries 1Remote Address Entries 19Currently Active Stations 20Largest Number of Stations 20Maximum Number of Stations 1790Hash Bucket Overflows 0Hash Table Overflows 0

Octets Received 0 Octets Transmitted 0

Time Since Last Reset 0 Hr, 28 Min, 41 Sec Reset Statistics



� �

Figure 5-3. Port 1 Statistics Panel

The following list describes information available on the Port N Statistics panel:

Local Frames ReceivedDisplays the number of frames that are confined to this segment and arenot forwarded by the switch.

Frames Switched by HardwareDisplays the number of frames received on this port and forwarded by the8271 hardware to another port.

All Forwarded FramesDisplays the number of frames received on this port and forwarded by the8271 hardware or software.

Frames from Unknown StationsDisplays the number of frames received on this port and forwarded to thesystem module for processing because the source or destination stationaddress was not in the port’s forwarding table.

Frames Delivered to SoftwareDisplays the number of frames received on this port and forwarded to thesystem module for processing.

Broadcast Packets ReceivedDisplays the number of broadcast frames received on this port withouterrors.


Local Address EntriesDisplays the number of stations on this port that belong to the localsegment.

Remote Address EntriesDisplays the number of stations on this port that belong to anothersegment.

Currently Active StationsDisplays the sum of local and remote stations.

Largest Number of StationsDisplays the largest number of stations active since the last reset of the8271.

Maximum Number of StationsDisplays the maximum number of stations that the port can supportsimultaneously.

Time since Last ResetDisplays the hours, minutes, and seconds since the port traffic counterswere last reset.

Reset StatisticsResets the traffic counters for this port.

Viewing Address TablesFrom the Statistics menu, select Address Tables... . Use the Address Tablesmenu to select the address table for the 8271, a specific domain, or a specific port.

�@ � Address Tables


Master Address Table...

Domain Address Table...

Port Address Table...

Display statistics for switch and for portsUse cursor keys to choose item. Press <ENTER> to confirm choice.


� �

Figure 5-4. Address Tables Menu


The following list defines functions available on the Address Tables menu:

Master Address TableDisplays a table of station addresses from all ports known to the 8271.See “Viewing the Master Address Table” for more information.

Domain Address TableDisplays the address table for the selected domain. See “Viewing theDomain Address Table” on page 5-7 for more information.

Port Address TableDisplays the address table for the selected port. See “Viewing the Port NAddress Table” on page 5-8 for more information.

Viewing the Master Address TableFrom the Statistics menu, select Address Tables... and then Master AddressTable... . The Master Address Table displays the station addresses of all portsknown to the 8271 in the order in which they are encountered. The table cancontain up to 10 000 entries.

�@ �Master Address Table

Address Local Port Ports (filtered/secured ports high-lighted)0004AC A40000 Swtch Base Adr 1 2 3 4 5 6 7 8 9 12 15 22 23 240004AC A40000 Swtch Base Adr 10 11 13 16 210004AC A40000 Swtch Base Adr 14 170004AC A40020 Domain 0 1 2 3 4 5 6 7 8 9 12 15 22 23 240004AC A40021 Domain 1 10 11 13 16 21

0004AC A40022 Domain 2 14 170180C2 000000 STP Multicast 1 2 3 4 5 6 7 8 9 12 15 22 23 240180C2 000000 STP Multicast 10 11 13 16 21

0180C2 000000 STP Multicast 14 170180C2 000001 Multicast 1 2 3 4 5 6 7 8 9 12 15 22 23 240180C2 000001 Multicast 10 11 13 16 21

0180C2 000001 Multicast 14 170180C2 000002 Multicast 1 2 3 4 5 6 7 8 9 12 15 22 23 24

Return More Search

Return to Previous MenuUse cursor keys to choose item. Press <ENTER> to confirm choice.


� �

Figure 5-5. Master Address Table

The following list describes the information available on the Master Address Table:

AddressDisplays the MAC address of a node.

Local PortDescribes the type of address or association of the address with the listedport.

Ports Displays the ports whose address tables include this MAC address.


Viewing the Domain Address TableFrom the Statistics menu, select Address Tables... and then Domain AddressTable... . The Domain Address Table displays the station addresses of all portsknown to the selected domain in the order in which they are encountered.

�@ �Domain Address Table - finance

Address Local Port Ports (filtered/secured ports high-lighted)0004AC A40000 Swtch Base Adr 10 11 13 16 210004AC A40021 Domain 1 10 11 13 16 210180C2 000000 STP Multicast 10 11 13 16 210180C2 000001 Multicast 10 11 13 16 210180C2 000002 Multicast 10 11 13 16 210180C2 000003 Multicast 10 11 13 16 210180C2 000004 Multicast 10 11 13 16 210180C2 000005 Multicast 10 11 13 16 210180C2 000006 Multicast 10 11 13 16 210180C2 000007 Multicast 10 11 13 16 210180C2 000008 Multicast 10 11 13 16 210180C2 000009 Multicast 10 11 13 16 210180C2 00000A Multicast 10 11 13 16 21

Return More Search



� �

Figure 5-6. Domain Address Table

The following list describes information available on the Domain Address Table:

AddressDisplays the MAC address of a node.

Local PortDescribes the type of address or association of the address with the listedport.

Ports Displays the ports whose address tables include this MAC address.


Viewing the Port N Address TableFrom the Statistics menu, select Address Tables... and then Port AddressTable... . Use the Port N Address Table to view the MAC addresses of nodesconnected to a specific port in the order they are encountered and to view thespanning tree status of this port. This table includes MAC addresses from whichthis port has received packets or to which it has sent packets. It can contain up to1700 entries.

�@ �Port 1 Address Table

Address Local Port SrcPkts DstPkts SrcBytes DstBytes0004AC A40000 Swtch Base Adr 0 0 0 00004AC A40020 Domain 0 0 0 0 00180C2 000000 STP Multicast 0 0 0 00180C2 000001 Multicast 0 0 0 00180C2 000002 Multicast 0 0 0 00180C2 000003 Multicast 0 0 0 00180C2 000004 Multicast 0 0 0 00180C2 000005 Multicast 0 0 0 00180C2 000006 Multicast 0 0 0 00180C2 000007 Multicast 0 0 0 00180C2 000008 Multicast 0 0 0 00180C2 000009 Multicast 0 0 0 00180C2 00000A Multicast 0 0 0 00180C2 00000B Multicast 0 0 0 0

Return More Search



� �

Figure 5-7. Port 1 Address Table

The following list describes information available on the Port N Address Table:

AddressDisplays the MAC address of a node. Ports that belong to an EtherPipeare designated as primary or secondary.

Local PortDisplays the port to which the node is attached.


Viewing the Spanning Tree Bridge InformationFrom the Statistics menu, select Spanning Tree Bridge Information... . TheSpanning Tree bridge information panel displays the spanning tree information thatis used only when this 8271 is the root bridge. This information is stored inNVRAM.

�@ �Spanning Tree - finance

Return

Participate in Spanning Tree Yes

Switch Priority 32768

Switch Hello Time 2

Switch Maximum Message Age 20

Switch Forward Delay 15



� �

Figure 5-8. Spanning Tree Bridge Information Panel

The following list describes the information available on the Spanning Tree bridgeinformation panel:

Participate in Spanning TreeIndicates whether or not the switch is participating in the spanning treeprotocol.

Switch PriorityDisplays the priority value for this 8271 when it is the root. When this8271 is the root, it has the lowest priority value in the spanning tree.

Switch Hello TimeDisplays the amount of time the 8271 waits before sending the nextconfiguration message when this switch is the root.

Switch Maximum Message AgeDisplays the maximum message age advertised when this 8271 is the rootswitch.

Switch Forward DelayDisplays the time the 8271 waits between transitions from listening tolearning, and from learning to forwarding when it is the root.


Viewing Current Spanning Tree InformationFrom the Statistics menu, select Current Spanning Tree Information... . TheCurrent Spanning Tree Information panel displays a summary of all spanning treeinformation for each port. You cannot change information on this panel.

Note: When the 8271 is configured with EtherPipes, spanning tree packets usethe primary (lowest-numbered) port of the EtherPipe.

�@ �Current Spanning Tree Information - default

Hello Time: 3, Max Message Age: 21, Forward Delay: 17Root: 30000.FFFF0000001F, Root Port: This Bridge is Root

Port Port Port Desig Designated Desig #Topo Time Since ID Cost STS Cost Switch/Bridge ID PortID Chgs Last Change

128.01 0 FWD 0 30000.FFFF0000001F 128.01 1 0:27:45

Return

Return to Statistics Main MenuUse cursor keys to select action. Press <ENTER> to confirm choice.


� �

Figure 5-9. Current Spanning Tree Information Panel

The following list describes the information available on the Current Spanning TreeInformation panel:

Hello TimeDisplays the Hello Time, in seconds, that is advertised by the root andused by all devices and switches in the active topology of the spanningtree network.

Max Message AgeDisplays the Maximum Message Age, in seconds, that is advertised by theroot and used by all devices and switches in the spanning tree network.

Forward DelayDisplays the Forward Delay Time, in seconds, that is advertised by theroot and used by all devices and switches in the spanning tree network.

Root Displays the priority and MAC address of the device in the spanning treethat this switch has accepted as the root device.

Root PortDisplays the number of the port on this switch that is closest to the root.This switch communicates with the root through this port. If there is noroot port, this switch has been accepted as the root of the spanning treenetwork.


Port ID Displays the port ID that is used to determine the role of the port in thespanning tree. The port ID is expressed in the form <port priority>.<portnumber>.

Port CostDisplays the Port Path Cost for each port on the switch. The Port PathCost helps determine the role of the port in the spanning tree.

Port STS (status)Displays the current status of this port within the spanning tree:

DSB Disabled

BLK Blocked

LSN Listening

LRN Learning

FWD Forwarding

The rules that define the state of the port are as follows:

¹ A port on a network segment with no other switch or bridge is alwaysforwarding.

¹ If two ports of the 8271 are connected to the same network segmentand there is no other bridge or switch, the port with the smaller ID isforwarded and the other is blocked.

¹ When the switch is booted, all ports are blocked initially, and thensome of them change to a different state: listening, learning, andforwarding, in that order. To see the change in states you mustrepeatedly exit from this menu, and then select it again. All ports thatare going to change states from blocking to forwarding will have doneso after two to three times the value of:

[Switch Maximum Message Age + (2 × Switch Forward Delay)]

Designated CostDisplays the cost for a packet to travel from this port to the root in thecurrent spanning tree configuration. The slower the media, the higher thecost.

Designated Switch/Bridge IDDisplays the Priority and Station address of the device through which thisport has determined it must communicate with the root of the spanningtree.

Designated Port IDDisplays the port on the designated bridge through which this switch willcommunicate with the root of the spanning tree. This information is usefulif the 8271 is the designated bridge on one or more network segments.

# Topo ChangesDisplays the number of topology changes, that is, the number of times theport has entered the FORWARDING state plus the number of times theport has made the transition from FORWARDING to BLOCKING. Thecounter is reset when the switch is reset or the spanning tree is turned on.

Time Since Last ChangeDisplays the time since the last time that the port entered the forwardingstate or made the transition from forwarding to blocking.


Viewing Virtual Switch StatisticsFrom the Statistics menu, select Virtual Switch Statistics... . The Virtual SwitchStatistics panel displays the current number of stations and the largest number ofstations in the master address table for the selected virtual switch.

�@ �Virtual Switch Statistics - default


Currently Active Stations 20

Largest Number of Stations 20

Maximum Number of Stations 10000

Display statistics for switch and for portsPress <ENTER> to exit menu.


� �

Figure 5-10. Virtual Switch Statistics Panel

The following list describes the information available on the virtual switch Statisticspanel:

Currently Active StationsDisplays the number of stations currently in the master address table thatare recognized by ports belonging to this virtual switch.

Largest Number of StationsDisplays the largest number of stations in the master address table sincethe last reset or power cycle that are recognized by ports belonging to thisvirtual switch.

Maximum Number of StationsDisplays the maximum number of stations allowable on the virtual switch.


Viewing IEEE 802.3 StatisticsFrom the Statistics menu, select IEEE 802.3 Statistics... The IEEE 802.3 Statisticspanel displays the 802.3 statistics for the selected port.

�@ �Port 1 IEEE 802.3 Statistics

Return to Previous Menu Alignment Errors 0 FCS Errors 0

Single Collision Frames 0Multiple Collision Frames 0SQE Test Errors 0

Deferred Transmissions 0 Late Collisions 0 Excessive Collisions 0

Internal MAC Transmit Errors 0Carrier Sense Errors 0

Oversize Frames 0Internal MAC Receive Errors 0

Reset Statistics



� �

Figure 5-11. IEEE 802.3 Statistics Panel

The data on this panel is useful for technical experts in solving complex problems.The meanings of the individual items are sufficiently detailed as to go beyond thescope of this user’s guide.

Diagnostic Test ResultsProvides the ability to display the results of diagnostic tests and any errors thatmight have occurred during power-up diagnostics.

Message Log InformationProvides the ability to display any message recorded by the system (ER_Error_logfunction).


Chapter 6. Troubleshooting

This chapter contains procedures that help you troubleshoot problems with an 8271and its connections to other devices.

Obtaining ServiceThere are no serviceable parts inside the 8271. Do not remove the cover of the8271 for any reason. The 8271 and its UFCs are individually replaceable, if theybecome defective. See “Warranty Service” on page C-5 for information concerningservice for the product. In the U.S., call 1-800-IBM-SERV (426-7378). In Canada,call &IBM. at 1-800-565-3344.

Troubleshooting in a NetworkThe 8271 console and SNMP management agent give you access to importantstatistics and other information about the network, as seen by the 8271. (SeeChapter 5, “Using the Statistics Panels” on page 5-1). The “Viewing Port NStatistics” on page 5-4 can be helpful in isolating network-level problems.

The EtherProbe allows a network analyzer to be attached to the 8271 tomonitor, in real time, activity at the switch. See “Configuring EtherProbe” onpage 4-33 for information on configuring EtherProbe.

Start of Troubleshooting ProcessIf one or more devices (such as PCs) connected to an 8271 are unable tocommunicate with other devices in the network, use the following steps tostart the troubleshooting process:

Step 1. Locate the 8271 to which the device is connected. Use the networksketch, the label on the cable connected to the device, or othernetwork records to help you locate the 8271.

Step 2. If you have a UFC and the problem is related to it, use itsdocumentation to assist in troubleshooting.

Step 3. If you have set up a console session (see Chapter 4, “Configuringthe 8271”), it can be used to determine whether diagnostics havebeen completed correctly. A list of normal diagnostic messages isshown on page 4-57.

Step 4. Observe the LEDs on the 8271 front panel. Figure 1-2 on page 1-4illustrates the LEDs. For explanations of the LEDs, see“Understanding the LEDs” on page 6-2. Review this section beforeproceeding with the troubleshooting process.

Step 5. In Table 6-3 on page 6-3, locate the symptom that best describesthe communication problem and the LED pattern you observed.Then, go to the section that contains the recommended actions forresolving the problem and follow that procedure.


Understanding the LEDsTable 6-1 lists the 8271 status LEDs and their meanings.

Table 6-2 lists the port LEDs and their meanings.

Table 6-1. 8271 Status LEDs and Their Meanings


| (Power)(green)

Top On The 8271 power supply is good.

Off The 8271 power supply is bad.

OK (green) Middle On The 8271 is working correctly.

Off The 8271 is not working correctly.

Unlabeled(Fault)(amber)

Bottom On A power-on failure has occurred.

Off The 8271 is working correctly.

Blinking Diagnostics are in progress.

Table 6-2. Port LEDs and Their Meanings

LED Position Meaning When On

Link (green) Top A cable is connected to the 10BASE-T port, the portdetects that a device is connected to the other end ofthe cable, and the port is receiving a link pulse from thedevice.

FDX (green) Middle The port is in full-duplex mode.

Tx/Rx (green) Bottom Data is being transmitted or received by the 8271.

Note: The port 1 Tx/Rx LED might blink even if there is no device attached to it. This isnormal.


Choosing a Troubleshooting ProcedureUse Table 6-3 to determine which troubleshooting procedure you should use.

Table 6-3. Symptom, LED State, and Recommended Procedure

Symptom and LED State Go to:

All of the LEDs are off. “Procedure A”

The Fault (amber) LED is on or the OK LED is off. “Procedure B”

None of the devices connected to the 8271 cancommunicate, the Fault (amber) LED is off, and thePower LED is on.

“Procedure C” on page 6-4

A single device connected to the 8271 is having troublecommunicating and all of the LED indications are normal.

“Procedure C” on page 6-4

A single device connected to the 8271 cannotcommunicate and the Link LED for its link segment is off.

“Procedure C,” Step 3 onpage 6-4 .

None of the devices connected to the 8271 cancommunicate with devices in the 10BASE5, 10BASE2, or10BASE-Fn portion of the network.

“Procedure D” on page 6-5

A UFC’s Fault (amber) LED is on or a device connectedto a UFC is experiencing problems.

See the service andtroubleshooting sections in theUFC documentation

Note: Link segment refers to a single cable or interconnected cables between an 827110BASE-T or AUI port and the device at the other end.

Procedure AUse this procedure if all of the LEDs are off:

Step 1. Verify that the power cord is connected at both ends and that thepower outlet is working.

Step 2. If the power cord is connected correctly, the outlet is working, andthe problem persists, the problem is in the 8271. See “WarrantyService” on page C-5.

Procedure BUse this procedure if the Fault (amber) LED is on:

Step 1. Reset the 8271 by disconnecting the power cord, waiting 10seconds, and then reconnecting it to the electrical outlet.

Step 2. If the problem does not go away, the problem is in the 8271. See“Warranty Service” on page C-5.

Chapter 6. Troubleshooting 6-3

Procedure CUse this procedure if one or more devices is having a communicationproblem, the Fault (amber) LED is off, the Power LED is on, or one or moreLink LEDs is off:

Step 1. Reset the 8271 by disconnecting the power cord, waiting 10seconds, and then reconnecting it to the electrical outlet.

a If the problem goes away, no further action is required.

b If the problem persists, continue with step 2.

Step 2. Observe the Link LED for each 8271 10BASE-T port to which a cableis connected.

a If a Link LED is off, continue with step 3.

b If all of the Link LEDs are on, go to step 7.

Step 3. For each 8271 10BASE-T port whose Link LED is off, perform thefollowing steps:

a Verify that each cable in the link segment is connected at bothends.

Be sure to check each cable in the link segment from the 8271to the device at the other end. Use the cable label to identifythe cable or cables in the link segment. Check any buildingwiring (in-the-wall cable) connections carefully. Also, verifythat the Link LED on the connected device is on, whichindicates that the link segment is connected.

If the connected device does not have a Link LED, run itsdiagnostics.

b If the Link LED is on, go to step 6.

c If the Link LED is off, continue with step 4.

Step 4. Verify that you are using the correct type of cable. If you areconnecting the 8271 to a hub, repeater, or another 8271, with MDI-Xports, use a crossover cable. If you are connecting the 8271 to aserver, PC, or workstation, use a straight-through cable.

a If the Link LED is on, go to step 6.

b If the Link LED is off, continue with step 5.

Step 5. Verify that each cable in the link segment is good. If you do nothave cable testing equipment, replace the cable with a cable that isthe correct kind and known to be good.

If the problem persists, there might be a problem with the adapterthat is preventing the device from communicating on the network.Run the adapter diagnostics or have someone else test the adapter.


Step 6. If the 8271 is connected to another 10BASE-T repeater, perform thefollowing steps:

a Verify that the 8271 duplex setting matches the attacheddevice.

b Verify that the other repeater is operating correctly.

c Verify that only one cable interconnects the two repeaters. Inother words, only one port on the 8271 should be connected toa port on the other repeater. Moreover, a 10BASE-T port andthe AUI port on the 8271 should not be connected to a10BASE-T port and an AUI port on the other repeater.

Step 7. If the 8271 is connected to a 10BASE5, 10BASE2, or 10BASE-Fntransceiver and none of the devices connected to the 8271 cancommunicate with the devices in the 10BASE5, 10BASE2, or10BASE-Fn portion of the network, go to “Procedure D.”

If the 8271 is not connected to a 10BASE5, 10BASE2, or 10BASE-Fntransceiver, continue with step 8.

Step 8. For each device that is having a communication problem, connectits link segment to another 10BASE-T port on the 8271. Try each ofthe remaining ports to determine whether the problem will go away.

a If the problem goes away, the problem might be in the 8271.See “Warranty Service” on page C-5.

b If the problem persists, continue with step 9.

Step 9. The problem does not appear to be in the 8271 and the cables anddevices connected to the 8271. The problem might be in thenetwork applications or other software running on the devices thatare having the communication problem. Refer to the softwaredocumentation for software problem determination procedures, orconsult your network administrator for assistance.

Procedure DUse the following procedure if none of the devices connected to the 8271 cancommunicate with devices in the 10BASE5, 10BASE2, or 10BASE-Fn portionof the network.

Step 1. Verify that the heartbeat is turned off on the transceiver attached tothe AUI port.

Step 2. Verify that no cable is connected to the port 1, 10BASE-T connector.

Step 3. Verify that the 8271 is connected to a transceiver on the 10BASE5,10BASE2, or 10BASE-Fn cable.

If an AUI cable is used to connect the 8271 to the transceiver, verifythat the cable is connected at both ends.

If the 8271 is connected directly to the transceiver without an AUIcable, verify that the 8271 port is firmly connected to the AUI port onthe transceiver.

Step 4. Verify that the AUI cable is good.


If an AUI cable connects the 8271 to the transceiver, replace the AUIcable with an AUI cable that is known to be good.

Step 5. Verify that the transceiver is good.

Replace the transceiver, or connect the 8271 to another transceiver(on the same cable) that is known to be good. Most transceivershave LEDs indicating power, traffic, and link. Refer to thetransceiver documentation.

Step 6. If the problem persists, the problem might be in the 8271. See“Warranty Service” on page C-5.

Parts ListingThe Parts Listing contains reference drawings and a corresponding index for all replaceable parts.The Index provides part numbers, the quantity required (units), and a description of the part.

Assembly 1: Final Assembly 8271 Model 108

VIEW A

VIEW A

23

4

1

56

7Management

(EIA 232)

Probe

Reset

OK

I

1 2 3 4 5 6 7 8

Link

FDx

Tx/Rx

Type 8270-001

S/N XXXXXX

MAC Address

XXXXXXXXXXXX

100-240V 10

0.4-0.2A 50/60 Hz

MDI

MDI-X

MDI

56

78

12

34

AUI

MDI

MDI-X

MDI

56

78

4

Asm– Part Index Number Units Description

1–1 13H9163 1 Final Asm–2 13H8962 1 Bracket, Mounting B–3 92G8546 4 Screws M4 x 8, Pan Head–4 13H8966 1 Bracket Asm,Cable Management–5 13H8961 1 Bracket, Mounting A–6 13H8967 1 Blank Universal Feature Slot Cover–7 42H0242 2 Thumbscrews M4 x 8


Assembly 2: Final Assembly 8271 Model 216

VIEW A

VIEW A

23

1

56

7Management

(EIA 232)

Probe

Reset

OK

I

1 2 3 4 5 6 7 8

Link

FDx

Tx/Rx

9 1 0 1 1 1 2 1 3 1 4 1 5 1 6

Link

FDx

Tx/Rx

MDI-X

MDI

MDI-X

Tx

Rx

Link/FDX

13

5

14

6

15

7

16

8

9

1

10

2

11

3

12

4

AUI

MDI-X

MDI

13

5

14

6

15

7

16

8

12

4

4

Tx

Rx

Link/FDX

Asm– Part Index Number Units Description

2–1 55H7132 1 Final Asm–2 41H7022 1 Bracket, Mounting B–3 92G8546 4 Screws M4 x 8, Pan Head–4 13H8966 1 Bracket Asm,Cable Management–5 41H7017 1 Bracket, Mounting A–6 13H8967 2 Blank Universal Feature Card Slot Cover–7 42H0242 4 Thumbscrews M4 x 8


Assembly 3: Line Cords Asm– Part Index Number Units Description

3–1 34G0232 1 Line Cord,125V,2.8m -Japan–2 13F9940 1 Line Cord,250V,2.8m -Australia, New Zealand, China–3 13F9959 1 Line Cord,125V,1.8m -Philippines, South Korea, Taiwan–4 13F9979 1 Line Cord,250V,2.8m -

Angola, Austria, Belgium, Bulgaria,Czech Republic, Egypt, Finland,France, Germany, Greece, Hungary, Iceland,Indonesia, Iran, Lebanon,Luxembourg, Mozambique,Netherlands, Norway, Poland,Portugal, Romania, Slovakia, Spain, Sudan,Sweden, Syria, Turkey,Yugoslavia, Zaire

–5 13F9997 1 Line Cord,250V,2.8m -Denmark–6 14F0015 1 Line Cord,250V,2.8m -Bangladesh,

Myanmar, Namibia, Pakistan,South Africa, Sri Lanka, Swaziland, Zimbabwe

–7 14F0033 1 Line Cord,250V,2.8m -Bahrain,Brunei, Cyprus, Ghana, Hong Kong,Iraq, India, Ireland, Jordan,Kenya, Kuwait, Libya, Macao,Malaysia, Malawi, Malta,Nigeria, Oman, Qatar, Sierra Leone,Singapore, Somalia, Tanzania,Uganda, United Arab Emirates, U.K.,Yemen, Zambia

–8 14F0051 1 Line Cord,250V,2.8m -Switzerland–9 14F0069 1 Line Cord,250V,2.8m -Ethiopia, Italy–10 14F0087 1 Line Cord,250V,2.8m -Israel–11 1838574 1 Line Cord,250V,2.8m -Thailand–12 6952300 1 Line Cord,100-125V,2.8m -Liberia,

Saudi Arabia–13 6952301 1 Line Cord,125V,1.8m -U.S.A., Canada


Chapter 7. Downloading Software and BootP Information

This chapter provides information on the download procedure that sendssoftware upgrades to the 8271 flash EEPROM using TFTP, or via the SerialPort.

Serial Port/TFTP Downloading with the Download MenuThis section provides information on initiating the download procedure withthe Download Menu.

Follow these steps to begin a software upgrade:

Step 1. If you are downloading via the serial port, insert the upgradediskette in your workstation drive. Make sure that your terminalsupports Xmodem protocol.

Step 2. If you are downloading via TFTP, copy the IBM binary file8271_XXXX.gz from the disk provided to the TFTP server and preparethe TFTP server.

Step 3. If you have not already done so, start a console session asdescribed in “Beginning the Console Session” on page 4-6, andadvance to the Main Menu.

Step 4. Select Download on the Main Menu as shown in Figure 4-2 onpage 4-7.

�@ � Download


Serial Link Download

TFTP Download...



� �Figure 7-1. Download Menu

Step 5. When the Download Menu appears (see Figure 7-1), select SerialLink Download or TFTP Download.

Step 6. If you chose Serial Link Download, go to step 8.

Step 7. If you chose TFTP Download, go to step 12 on page 7-2.

Step 8. Confirm the download when you are prompted to do so by thefollowing message:


Please confirm new code download via serial port (Y or N):

Step 9. The following messages appear:

Console: Beginning Xmodem download of main imageConsole: Waiting for binary file....

Step 10. Use a terminal emulator program on your PC to download the binaryfile using Xmodem protocol.

The download takes approximately 5 minutes at 9600 baud.

When the download is complete, the following messages appear:

Console: Beginning Xmodem download of main imageConsole: Waiting for binary file.... DoneConsole: Preparing Flash....Done.Console: Saving Main Image into Flash...Done

Please confirm switch reset (Y or N):

Step 11. Confirm the reset and the procedure is complete.

Step 12. When the TFTP Download Menu appears (see Figure 7-2), fill in thefields and then select Execute Network Download.

Step 13. Confirm the download when you see the message:

Please confirm new code download via network (Y or N):

�@ �

TFTP Download


TFTP Server Address 0.0.0.0

Download Domain default

Download Filename

Execute Network Download


Press <CTRL><N> to return to Main Menu.� �Figure 7-2. TFTP Download Menu

Step 14. Press Enter when you see the message:

Download complete - reset switch to activate new software.Press <Enter> to continue......

Step 15. Reset the 8271, as instructed, to activate the new code.


Initiating a Download with the System Request MenuThis section provides information on initiating the download procedure withthe System Request Menu.

Note: This function should be used only at the direction of servicepersonnel.

Follow these steps to begin a software upgrade:

Step 1. If you have not already done so, start a console session asdescribed in “Beginning the Console Session” on page 4-6, andadvance to the Copyright screen.

Step 2. Press the System Request button, the unlabeled button on the lowerleft portion of the front panel beside the Reset button. The consolewill display the menu as shown in Figure 7-3.

�@ �System Request Menu

-------------------

1. Xmodem download of boot image2. Xmodem download of main image

3. Clear Non-Volatile RAM4. Reset the system

0. Exit and continue

Choice=>

� �Figure 7-3. System Request Menu

Step 3. Select your Download option from the console. and continue withthe procedure.

Step 4. The following messages appear:

SYSREQ: Beginning Xmodem download of main(or boot) imageSYSREQ: Waiting for binary file....

Step 5. Use a terminal emulator program on your PC to download the binaryfile using Xmodem protocol.

The download takes approximately 5 minutes at 9600 baud.

When the download is complete, the following messages appear:

Chapter 7. Downloading Software and BootP Information 7-3

SYSREQ: Beginning Xmodem download of main imageSYSREQ: Waiting for binary file.... DoneSYSREQ: Preparing Flash....Done.SYSREQ: Saving Main Image into Flash...Done

SYSREQ: Press any key to return to menu.

BootPThe Bootstrap Protocol (referred to as BootP) function allows the 8271 toparticipate in RFC 951-compliant environments. BootP uses User DatagramProtocol (UDP) to formulate a network request to allow a device to configureits IP address for a given logical 8271.

BootP ProcedureStep 1. Edit the BootPTAB file on the BootP server (see “Editing the

BootPTAB File” on page 7-5). Make sure that the IP address isalready configured on the 8271.

Step 2. Initiate the BootP daemon ( BootPD) on the BootP server.

Step 3. Make sure that the IP State in the IP Configuration Menu is set toBootP When Needed or BootP Always.

Step 4. Initiate the BootP transfer by resetting the 8271. A BootP isautomatically initiated after diagnostics have been completed.

Note: Do not configure multiple BootP servers to a single 8271.

The BootP sequence consists of IP address determination and bootfileselection, if configured, using BootP request and reply.

In order for you to utilize the BootP function, a BootP server must beconfigured on the network. This BootP server must reside on the samesubnet as the 8271. A typical implementation might consist of a BootPdaemon (BootPD or IN.BootPD) or something similar. BootPD reads a startupfile called BootPTAB. This file contains various strings that describe howBootP clients are configured. An entry is made in the BootPTAB file for eachBootP client (in this case, the 8271) on the network. Figure 7-4 on page 7-5displays an example of a BootPTAB file for configuring two 8271s.

The 8271 BootP function has been tested in the following environments:

¹ Solaris with an HP version of CMU BootP¹ Santa Cruz Operation UNIX with an SCO BootP¹ LattisNet DOS Network Management Station¹ IBM NetView for AIX

¹ IBM OS/2


Editing the BootPTAB FileFigure 7-4 shows an example of a BootPTAB file.

#Blank lines and lines beginning with '#' are ignored.#Legend:# first field--hostname (may be full domain name)# bf--bootfile# bs--bootfile size# cs--cookie servers# ds--domain name servers# gw--gateway address list# ha--host hardware address# hd--bootfile home directory# hn--send hostname# ht--hardware type# im--impress servers# ip--host IP address# lg--log servers# lp--LPR servers# ns--IEN-116 name servers# rl--resource location protocol servers# sm--subnet mask# tc--template host (points to similar host entry)# to--time offset (seconds)# ts--time servers# vm--vendor magic cookie selector

#Be certain to include backslashes where they are needed.Define different master entries for each 8271 (or virtual switch).S82711:\ hn:\ ht=ether:\ vm=rfc1048:\ ha=008024016851:\ ip=134.177.169.111:\ sm=255.255.0.0:\ gw=134.177.169.201:\ bf=/etc/8271_XXXX.gz:

S82712:\ hn:\ ht=ether:\ vm=rfc1048:\ ha=00802401685D:\ ip=134.177.169.48:\ sm=255.255.0.0:\ gw=134.177.169.201:\ bf=/etc/8271_XXXX.gz:

Figure 7-4. Example of a BootPTAB File


Configure the BootPTAB file to the 8271 to which the BootP server isattached. Associate the MAC address and the IP address for Domain 0 aslisted in the Master Address Table (see “Viewing the Master Address Table”on page 5-6).

Note: Do not use the MAC address in the System Information Menu.

Figure 7-5 displays the address for Domain 0. The address for the 8271(008024 016850) is the address on the System Information Menu. The addressthat is loaded for Domain 0 in the BootPTAB file is 008024 016851. If other8271s were configured, the address associated with those 8271s is entered inthe BootPTAB file in the BootP server associated with that 8271. (In thisexample, the second 8271 has the address 008024 01685D.)

If the 8271 has virtual switch configured, a BootP server is attached to eachconfigured domain. The BootPTAB file contains the address for that specificdomain.

�@ �Master Address Table

Address Local Port Ports (filtered/secured ports high-lighted)0004AC A40000 Swtch Base Adr 1 2 3 4 5 6 7 8 9 12 15 22 23 240004AC A40000 Swtch Base Adr 10 11 13 16 210004AC A40000 Swtch Base Adr 14 170004AC A40020 Domain 0 1 2 3 4 5 6 7 8 9 12 15 22 23 240004AC A40021 Domain 1 10 11 13 16 21

0004AC A40022 Domain 2 14 170180C2 000000 STP Multicast 1 2 3 4 5 6 7 8 9 12 15 22 23 240180C2 000000 STP Multicast 10 11 13 16 21

0180C2 000000 STP Multicast 14 170180C2 000001 Multicast 1 2 3 4 5 6 7 8 9 12 15 22 23 240180C2 000001 Multicast 10 11 13 16 21

0180C2 000001 Multicast 14 170180C2 000002 Multicast 1 2 3 4 5 6 7 8 9 12 15 22 23 24

Return More Search



� �

Figure 7-5. Example of a Master Address Table

Note: BootP has a limitation with respect to the gateway entry. The serverdevice IP address is written into the “gw” gateway address filed when theconfiguration is downloaded. Thus, you must configure the gateway addresson the 8271 at the end of the download sequence. Refer to your UNIXoperating system environment manual for further information.


BootP/TFTP Limitations¹ Do not configure multiple BootP servers to handle the same hardware

address.

¹ When you use the virtual switch function, BootP configures the IPaddress of the BootP-connected network.

¹ The IBM BootP implementation does not need or handle any BootPextensions.

¹ If the download is interrupted or corrupted, you must download a newimage using the serial port download (see “Serial Port/TFTP Downloadingwith the Download Menu”).

¹ If the network broadcast traffic is 200 packets per second or more, theTFTP request might not be initiated by the 8271. You must reset the 8271and download a new image using the serial port download (see “SerialPort/TFTP Downloading with the Download Menu”).

¹ The BootP function might not work if BootP request and reply framesmust cross token-ring segments.

Error MessagesDuring the BootP download procedure, the 8271 might encounter certainerror conditions. When this occurs, the 8271 sends error messages to theconsole.


Appendix A. Planning Charts

The planning charts on the following pages can be photocopied and used forplanning the installation and configuration of the 8271s in your network.

Copyright IBM Corp. 1996 A-1

A-2 8271 Nways EN LAN Switch Planning and Installation Guide

IBM 8271 Cabling Chart

9 10 11 12 13 14 15 16

Port NumberPort Number

Universal Feature Card #1 CablingUFC Type

Universal Feature Card #2 CablingUFC Type

Connectto (ie, PortNumber,Device, andLocation)

Connectto (ie, PortNumber,Device, andLocation)

Crossover

Straight-through

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP UTP

MDI

MDI

STP

STP STP

MDI-X

MDI-X

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T

10BASE-T 10BASE-T

10BASE-T

10BASE-T

AUI EIA 232-C

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP

STP

STP

Crossover

Straight-through

Crossover

Straight-through

AUI

AUI

UTP

UTP

STP

STP

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP

STP

STP

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP

STP

STP

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP

STP

STP

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP

STP

STP

Crossover

Straight-through

Crossover

Straight-through

UTP

UTP

STP

STP

Serial

NullModem

8271

8271

Appendix A. Planning Charts A-3

IBM 8271 Configuration Parameters Worksheet

Switch Information Menu“Viewing Switch Information” on page 4-10

Unit Number ________________________

System Name ________________________

System Location _______________________

System Contact _______________________

Enhanced Features _______________________


Virtual Switch Port Configuration Menu“Configuring Virtual Switch Ports” on page 4-13

Record in the table the name of the domain associated with each port.

Port Domain Name

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24


Virtual Switch Name Configuration Menu“Naming Virtual Switch Domains” on page 4-15

Record in the table the name assigned to each domain.

Index Domain Name

1

2

3

4

5

6

7


IP Configuration Menu“Configuring IP Parameters” on page 4-17

DomainName

Parameter

Value

IP AddressDefault: 0.0.0.0

_____._____._____._____

Default GatewayDefault: 0.0.0.0

_____._____._____._____

Subnet MaskDefault: 0.0.0.0

_____._____._____._____

IP StateDefault: BootP When Needed

____________________


_____._____._____._____


_____._____._____._____


_____._____._____._____


____________________


_____._____._____._____


_____._____._____._____


_____._____._____._____


____________________


_____._____._____._____


_____._____._____._____


_____._____._____._____


____________________

Make additional copies of this page if you have more than four domains.


SNMP Configuration Menu“Configuring SNMP” on page 4-19

Send Authentication-Failure TrapsMark the appropriate box.

Default: Yes

Yes No

Community Strings Menu“Setting Community Strings Parameters” on page 4-20

Index

Community Name

Mode

R W

1

2

3

4

5

6

7

8

9

10


Trap Receivers Menu“Setting Trap Receivers” on page 4-21

DomainName

Index

IP Address

Trap Community Name

1 _____._____._____._____

2 _____._____._____._____

3 _____._____._____._____

4 _____._____._____._____

5 _____._____._____._____

6 _____._____._____._____

1 _____._____._____._____

2 _____._____._____._____

3 _____._____._____._____

4 _____._____._____._____

5 _____._____._____._____

6 _____._____._____._____

1 _____._____._____._____

2 _____._____._____._____

3 _____._____._____._____

4 _____._____._____._____

5 _____._____._____._____

6 _____._____._____._____

1 _____._____._____._____

2 _____._____._____._____

3 _____._____._____._____

4 _____._____._____._____

5 _____._____._____._____

6 _____._____._____._____

Make additional copies of this page if you have more than four domains.


Spanning Tree Menu“Configuring Spanning Tree” on page 4-22

Domain Parameter Value

Participate in Spanning TreeDefault: No

Yes _____ No _____

Switch PriorityRange: 0 to 65 535 Default: 32 768

Switch Hello TimeRange (in seconds): 1 to 10 Default: 2

Switch Maximum Message AgeRange (in seconds): 6 to 40 Default: 20

Switch Forward DelayRange (in seconds): 4 to 30 Default: 15


Yes _____ No _____






Yes _____ No _____






Yes _____ No _____





Make additional copies of this page if you have more than three domains.


Spanning Tree – Port Priority Menu“Setting Port Priority” on page 4-24

Record in the table the priority for each port.

Range: 1 to 255

Default: 128

Port: 1 2 3 4 5 6 7 8

Priority:

Port: 9 10 11 12 13 14 15 16

Priority:

Port: 17 18 19 20 21 22 23 24

Priority:

Spanning Tree – Port Path Cost Menu“Setting Port Path Cost” on page 4-26

Record in the table the cost of each port.

Range: 1 to 65 535

Default: 100

Port: 1 2 3 4 5 6 7 8

Path Cost:

Port: 9 10 11 12 13 14 15 16

Path Cost:

Port: 17 18 19 20 21 22 23 24

Priority:


Port Configuration Menu“Viewing Port Configuration” on page 4-30

Mark the appropriate box to select the activation and duplex mode for each port.

Default: Enabled, Half Duplex

Port: 1 2 3 4 5 6 7 8

Enabled

Disabled

Half Duplex

Full Duplex

Port: 9 10 11 12 13 14 15 16

Enabled

Disabled

Half Duplex

Full Duplex

Port: 17 18 19 20 21 22 23 24

Enabled

Disabled

Half Duplex

Full Duplex


EtherPipe Menu“Configuring EtherPipes” on page 4-35

Write the port numbers in each EtherPipe in the table.

EtherPipe Ports

1

2

3

4


MAC Filter Configuration Menu“Configuring MAC Filters” on page 4-38

FilterNumber

MAC Address

Filter Type

Applied Ports

Exit Ports

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Make additional copies of this page if you have more than thirty filters.


Port Security Mode Menu“Configuring Port Security Mode” on page 4-40

Record in the table the security mode for each port.

Possible values include the following options:

NormalSecure Source AddressSecure Destnation AddressSecure both source and destntion address

Default: Normal

Port Security Mode

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24


Port Address Table Aging Menu“Viewing or Changing Port Address Table Aging” on page 4-44

Record in the table the aging time and demand aging level for each port.

Aging Time:Range (in minutes): 0 to 999 (0 is disabled)Default: 15 minutes Value:______

Demand Aging Level (%)Range (in percent): 50, 60, 70, 80, or 90Default: 90%

Port Aging Time (min) Demand Aging Level(%)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24


Master Address Table Aging Menu“Viewing or Changing Master Address Table Aging” on page 4-46

Address Aging Time:Range (in minutes): 0 to 9999Default: 120 minutes Value:______

Demand Aging Level:Range (in percent): 0 to 90Default: 50% Value:______


Port Switching Mode Menu“Viewing or Changing Port Switching Mode” on page 4-47

Record in the table the switching mode of each port.

Switching Mode:Auto, Cut-through, or Store and ForwardDefault: Auto

Error Water Mark:Range (in percent): 0 to 100Default: 50%

Runt-Free ModeOn or OffDefault: Off

Port Switching Mode Error Water Mark Runt-Free Mode

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24


Password Menu“Configuring and Changing the Password” on page 4-51

Current Password:_______________ New Password:_______________

Console Serial Configuration Menu“Configuring Serial Link for the Console” on page 4-53

Hardware Flow Control:_________

Software Flow Control:__________

Autobaud upon Break:__________

Console Baud RateMark the appropriate box to select the console baud rate.

Default: 9600

Baud Rate 1200 2400 4800 9600 19 200

Set to:

Console Telnet Configuration Menu“Configuring Telnet for a Console Session” on page 4-54

Number of Telnet Sessions Allowed:_____

Disallow New Telnet Session:_____


Appendix B. Cable and Pin Information

This appendix provides information on cables that can be used with the 8271. Italso provides minimum pin-out information so that you can verify that the cablesthat you are using are correctly wired.

Connecting to the NetworkTable B-1 lists the types of connections that are used when connecting the 8271 tothe network. Remember to use crossover cables when connecting port types thatare alike (MDI to MDI, or MDI-X to MDI-X). Use straight-through cables for allother connections.

Table B-1. Typical Port Types

Connecting Device Typical Port Types

Hub or repeater MDI-X

Server, PC, workstation MDI


Model 108 port 8 MDI or MDI-X switchable


Model 216 port 16 MDI or MDI-X

Connecting to the Management (EIA 232) PortTable B-2 lists the type of cables that are used when connecting to the EIA 232port on the 8271.

Table B-2. Connecting the 8271 to the EIA 232 Port

Cable Function Cable Type or Cable Solution

Connect a modem to the EIA 232 port Connect one end of a straight-through EIA232 modem cable to the EIA 232 port andthe other to the modem.

Connect a PC or other DTE device to theEIA 232 port

Connect one end of a crossover EIA 232cable to the EIA 232 port and the other endto the PC or DTE device.Attach a null-modem adapter to the EIA 232port. Then, attach a straight-throughmodem cable to the null-modem adapter.

Copyright IBM Corp. 1996 B-1

Twisted-Pair Cable Pin-OutsWhen connecting devices to the 10BASE-T ports on the 8271, you must use eithera straight-through or a crossover twisted-pair cable. Diagrams of each of thesecables follow.

Straight-Through UTP CableUse a staight-through cable to connect MDI-X ports to MDI ports.

Figure B-1. Straight-Through Cable

Crossover UTP CableUse a crossover cable to connect MDI ports to MDI ports or MDI-X ports to MDI-Xports.

Figure B-2. Crossover UTP Cable

B-2 8271 Nways EN LAN Switch Planning and Installation Guide

IBM STP Data Connector-to-RJ-45 Straight-Through CableUse a straight-through cable to connect MDI ports to MDI-X ports.

Figure B-3. IBM Cabling System Data Connector-to-RJ-45 Straight-Through Cable

IBM STP Data Connector-to-RJ-45 Crossover CableUse a crossover cable to connect MDI ports to MDI ports or MDI-X ports to MDI-Xports.

RJ-45Pins

IBM Cabling SystemData Connector Color Code

1236

RedGreenBlackOrange

Figure B-4. IBM Cabling System Data Connector-to-RJ-45 Crossover Cable

AUI Cable Pin-OutFigure B-5 shows the pin-out of an AUI cable. Use an AUI cable when connectingan Ethernet transceiver to the AUI port on the 8271.

Figure B-5. Pin-Out of the AUI Cable

Appendix B. Cable and Pin Information B-3

EIA 232 Port and Cable Pin-OutsThe 8271 has an EIA 232 port wired as a DTE. For this reason, you cannot use astraight-through modem cable to connect a terminal directly to the EIA 232 port.

For a terminal connection, you can use either a null-modem cable, or a modemcable with a null-modem adapter attached. For a modem connection, you can usea standard modem cable.

This section provides pin-out information for the cables you can use to connect tothe EIA 232 port.

EIA 232 Port Pin-Out

Figure B-6. Pin-Out of the EIA 232 Port

EIA 232 Modem Cable ConnectionsUse a straight-through modem cable to connect the EIA 232 port of the 8271 to amodem.

Signal NameModem End25-Pin Male

Switch End9-Pin Female

TXDRXDRTSCTSDSRGNDDCDDTRRI

23456782022

327865149

Figure B-7. EIA 232 Modem Cable

EIA 232 Null-Modem ConnectionsUse a null-modem (crossover) cable shown in Figure B-8 on page B-5 to connectthe EIA 232 port to a terminal (DTE) with a 25-pin connector. Alternatively you canuse a modem cable and a null-modem adapter. DTR (pin 20) and RTS (pin 4)must be on, or high, on your terminal or in your terminal emulation program.


Signal NameTerminal /PC End25-Pin Male



23456782022

327865149

Figure B-8. EIA 232 Null-Modem Cable for Terminal with 25-Pin Connector

Use a null-modem (crossover) cable shown in Figure B-9 to connect the EIA 232port to a terminal (DTE) with a 9-pin connector. Alternatively you can use amodem cable and a null-modem adapter. DTR (pin 4) and RTS (pin 7) must be on,or high, on your terminal or in your terminal emulation program.

Signal NameTerminal /PC End9-Pin Male



327865149

327865149

Figure B-9. EIA 232 Null Modem Cable for Terminal with 9-Pin Connector

Appendix B. Cable and Pin Information B-5

Appendix C. Notices and Product Warranty

References in this publication to IBM products, programs, or services do not implythat IBM intends to make these available in all countries in which IBM operates.Any reference to an IBM product, program, or service is not intended to state orimply that only IBM’s product, program, or service may be used. Any functionallyequivalent product, program, or service that does not infringe any of IBM’sintellectual property rights may be used instead of the IBM product, program, orservice. Evaluation and verification of operation in conjunction with other products,except those expressly designated by IBM, are the user’s responsibility.

IBM may have patents or pending patent applications covering subject matter inthis document. The furnishing of this document does not give you any license tothese patents. You can send license inquiries, in writing, to the IBM Director ofLicensing, IBM Corporation, 500 Columbus Avenue, THORNWOOD NY 10594USA.

Electronic Emission Notices

Federal Communications Commission (FCC) StatementNote: This equipment has been tested and found to comply with the limits for aClass A digital device, pursuant to Part 15 of the FCC Rules. These limits aredesigned to provide reasonable protection against harmful interference when theequipment is operated in a commercial environment. This equipment generates,uses, and can radiate radio frequency energy and, if not installed and used inaccordance with the instruction manual, may cause harmful interference to radiocommunications. Operation of this equipment in a residential area is likely to causeharmful interference, in which case the user will be required to correct theinterference at his own expense.

Properly shielded and grounded cables and connectors must be used in order tomeet FCC emission limits. IBM is not responsible for any radio or televisioninterference caused by using other than recommended cables and connectors or byunauthorized changes or modifications to this equipment. Unauthorized changes ormodifications could void the user's authority to operate the equipment.

This device complies with Part 15 of the FCC Rules. Operation is subject to thefollowing two conditions: (1) this device may not cause harmful interference, and(2) this device must accept any interference received, including interference thatmay cause undesired operation.

Industry Canada Class A Emission Compliance Statement

This Class A digital apparatus meets the requirements of the CanadianInterference-Causing Equipment Regulations.

Avis de conformité aux normes d'Industrie Canada

Cet appareil numérique de la classe A respecte toutes les exigences du Règlementsur le matériel brouilleur du Canada.

Copyright IBM Corp. 1996 C-1

European Community (CE) Mark of Conformity Statement forUnshielded

Cable

This product is in conformity with the protection requirements of EU CouncilDirective 89/336/EEC on the approximation of the laws of the Member Statesrelating to electromagnetic compatibility. IBM cannot accept responsibility for anyfailure to satisfy the protection requirements resulting from a non-recommendedmodification of the product, including the fitting of non-IBM option cards.

This product has been tested and found to comply with the limits for Class AInformation Technology Equipment according to CISPR 22/European Standard EN55022. The limits for Class A equipment were derived for commercial andindustrial environments to provide reasonable protection against interference withlicensed communication equipment. Warning: This is a Class A product. In adomestic environment this product may cause radio interference in which case theuser may be required to take adequate measures.

Dieses Gerät ist berechtigt in Übereinstimmung mit dem deutschen EMVG vom9.Nov.92 das EG-Konformitätszeichen zu führen. Der Au8271teller derKonformitätserklärung ist die IBM United Kingdom Laboratories Limited, Mail Point147, Hursley Park Winchester, Hampshire S021 2JN, England.

Dieses Gerät erfüllt die Bedingungen der EN 55022 Klasse A. Für diese Klassevon Geräten gilt folgende Bestimmung nach dem EMVG: Geräte dürfen an Orten,für die sie nicht ausreichend entstört sind, nur mit besonderer Genehmigung desBundesminesters für Post und Telekommunikation oder des Bundesamtes für Postund Telekommunikation betrieben werden. Die Genehmigung wird erteilt, wennkeine elektromagnetischen Störungen zu erwarten sind. Auszug aus dem EMVGvom 9.Nov.92, Para.3, Abs.4)

Hinwies:

Dieses Genehmigungsverfahren ist von der Deutschen Bundespost noch nichtveröffentlicht worden.

European Union (EU) Statement For Shielded CableThis product is in conformity with the protection requirements of EU CouncilDirective 89/336/EEC on the approximation of the laws of the Member Statesrelating to electromagnetic compatibility. IBM cannot accept responsibility for anyfailure to satisfy the protection requirements resulting from a non-recommendedmodification of the product, including the fitting of non-IBM option cards.

This product has been tested and found to comply with the limits for Class BInformation Technology Equipment according to CISPR 22 / European Standard EN55022. The limits for Class B equipment were derived for typical residentialenvironments to provide reasonable protection against interference with licensedcommunication devices.

Dieses Gerät ist berechtigt in Übereinstimmung mit dem deutschen EMVG vom9.Nov.92 das EG-Konformitätszeichen zu führen. Der Au8271teller derKonformitätserklärung ist die IBM, IBM United Kingdom Laboratories Limited, MailPoint 147, Hursley Park Winchester, Hampshire SO21 2JN, England.

C-2 8271 Nways EN LAN Switch Planning and Installation Guide

Dieses Gerät erfüllt die Bedingungen der EN 55022 Klasse B.

Japanese Voluntary Control Council for Interference (VCCI) StatementThis equipment is in the 1st Class category (information equipment to be used incommercial and/or industrial areas) and conforms to the standards set by theVoluntary Control Council for Interference by Information Technology Equipmentaimed at preventing radio interference in commercial and industrial areas.

Consequently, when used in a residential area or in an adjacent area thereto, radiointerference may be caused to radios and TV receivers, etc.

Read the instructions for correct handling.

Appendix C. Notices and Product Warranty C-3

TrademarksThe following terms are trademarks of the IBM Corporation in the United States orother countries or both:

Microsoft and Windows are trademarks or registered trademarks of Microsoft Corporation.

UNIX is a registered trademark in the United States and other countries licensedexclusively through X/Open Company Limited.

Other company, product, and service names, may be trademarks or service marksof others.

AIX IBM Nways RISC System/6000EtherStreamer NetView OS/2


Statement of Limited Warranty

The warranties provided by IBM in this Statement of Limited Warranty apply only to Machines youoriginally purchase for your use, and not for resale, from IBM or your reseller. The term “Machine”means an IBM machine, its features, conversions, upgrades, elements, or accessories, or anycombination of them. Unless IBM specifies otherwise, the following warranties apply only in the countrywhere you acquire the Machine. If you have any questions, contact IBM or your reseller.

International Business Machines Corporation Armonk, New York, 10504

Machine: IBM 8271 Nways Ethernet LAN Switch

Warranty Period*: One Year

*Contact your place of purchase for warranty service information.

Production StatusEach Machine is manufactured from new parts, or new and used parts. In some cases, the Machinemay not be new and may have been previously installed. Regardless of the Machine's productionstatus, IBM's warranty terms apply.

The IBM Warranty for MachinesIBM warrants that each Machine 1) is free from defects in materials and workmanship and 2) conformsto IBM's Official Published Specifications. The warranty period for a Machine is a specified, fixed periodcommencing on its Date of Installation. The date on your receipt is the Date of Installation, unless IBMor your reseller informs you otherwise.

During the warranty period IBM or your reseller, if authorized by IBM, will provide warranty service underthe type of service designated for the Machine and will manage and install engineering changes thatapply to the Machine.

For IBM or your reseller to provide warranty service for a feature, conversion, or upgrade, IBM or yourreseller may require that the Machine on which it is installed be 1) for certain Machines, the designated,serial-numbered Machine and 2) at an engineering-change level compatible with the feature, conversion,or upgrade. Many of these transactions involve the removal of parts and their return to IBM. Yourepresent that all removed parts are genuine and unaltered. A part that replaces a removed part willassume the warranty service status of the replaced part.

If a Machine does not function as warranted during the warranty period, IBM or your reseller will repair itor replace it with one that is at least functionally equivalent, without charge. The replacement may notbe new, but will be in good working order. If IBM or your reseller is unable to repair or replace theMachine, you may return it to your place of purchase and your money will be refunded.

If you transfer a Machine to another user, warranty service is available to that user for the remainder ofthe warranty period. You should give your proof of purchase and this Statement to that user. However,for Machines which have a life-time warranty, this warranty is not transferable.

Warranty ServiceTo obtain warranty service for the Machine, you should contact your reseller or call IBM. In the UnitedStates, call IBM at 1-800-IBM-SERV (426-7378). In Canada, call IBM at 1-800-565-3344. You may berequired to present proof of purchase.

IBM or your reseller will provide certain types of repair and exchange service, either at your location orat IBM's or your reseller's service center, to restore a Machine to good working order.

When a type of service involves the exchange of a Machine or part, the item IBM or your resellerreplaces becomes its property and the replacement becomes yours. You represent that all removeditems are genuine and unaltered. The replacement may not be new, but will be in good working orderand at least functionally equivalent to the item replaced. The replacement assumes the warranty servicestatus of the replaced item. Before IBM or your reseller exchanges a Machine or part, you agree toremove all features, parts, options, alterations, and attachments not under warranty service. You alsoagree to ensure that the Machine is free of any legal obligations or restrictions that prevent its exchange.

You agree to:

Appendix C. Notices and Product Warranty C-5

1. obtain authorization from the owner to have IBM or your reseller service a Machine that you do notown; and

2. where applicable, before service is provided —a. follow the problem determination, problem analysis, and service request procedures that IBM or

your reseller provide,b. secure all programs, data, and funds contained in a Machine, andc. inform IBM or your reseller of changes in a Machine's location.

IBM is responsible for loss of, or damage to, your Machine while it is 1) in IBM's possession or 2) intransit in those cases where IBM is responsible for the transportation charges.

Extent of WarrantyIBM does not warrant uninterrupted or error-free operation of a Machine.

The warranties may be voided by misuse, accident, modification, unsuitable physical or operatingenvironment, improper maintenance by you, removal or alteration of Machine or parts identificationlabels, or failure caused by a product for which IBM is not responsible.

THESE WARRANTIES REPLACE ALL OTHER WARRANTIES OR CONDITIONS,EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIEDWARRANTIES OR CONDITIONS OF MERCHANTABILITY AND FITNESS FOR APARTICULAR PURPOSE. THESE WARRANTIES GIVE YOU SPECIFIC LEGAL RIGHTSAND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM JURISDICTION TOJURISDICTION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION ORLIMITATION OF EXPRESS OR IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION ORLIMITATION MAY NOT APPLY TO YOU. IN THAT EVENT SUCH WARRANTIES ARELIMITED IN DURATION TO THE WARRANTY PERIOD. NO WARRANTIES APPLY AFTERTHAT PERIOD.

Limitation of LiabilityCircumstances may arise where, because of a default on IBM's part or other liability you are entitled torecover damages from IBM. In each such instance, regardless of the basis on which you are entitled toclaim damages from IBM (including fundamental breach, negligence, misrepresentation, or other contractor tort claim), IBM is liable only for:

1. damages for bodily injury (including death) and damage to real property and tangible personalproperty; and

2. the amount of any other actual direct damages or loss, up to the greater of U.S. $100,000 or thecharges (if recurring, 12 months' charges apply) for the Machine that is the subject of the claim.

UNDER NO CIRCUMSTANCES IS IBM LIABLE FOR ANY OF THE FOLLOWING: 1)THIRD-PARTY CLAIMS AGAINST YOU FOR LOSSES OR DAMAGES (OTHER THANTHOSE UNDER THE FIRST ITEM LISTED ABOVE); 2) LOSS OF, OR DAMAGE TO, YOURRECORDS OR DATA; OR 3) SPECIAL, INCIDENTAL, OR INDIRECT DAMAGES OR FORANY ECONOMIC CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS ORSAVINGS), EVEN IF IBM OR YOUR RESELLER IS INFORMED OF THEIR POSSIBILITY.SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OFINCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE EXCLUSION ORLIMITATION MAY NOT APPLY TO YOU.


Glossary

This glossary includes terms and definitions from theIBM Dictionary of Computing (New York; McGraw-Hill,Inc., 1994).

¹ The symbol (A) identifies definitions from theAmerican National Standard Dictionary forInformation Systems, ANSI X3.172-1990, copyright1990 by the American National Standards Institute(ANSI). Copies can be purchased from theAmerican National Standards Institute, 1430Broadway, New York, New York 10018.

¹ The symbol (E) identifies definitions from theANSI/EIA Standard-440-A, Fiber Optic Terminology.

¹ The symbol (I) identifies definitions from publishedparts of the Information Technology Vocabulary,developed by Subcommittee 1, Joint TechnicalCommittee 1, of the International Organization forStandardization and the InternationalElectrotechnical Commission (ISO/IEC JTC1/SC1).

¹ The symbol (T) identifies definitions from draftinternational standards, committee drafts, and

working papers being developed by ISO/IECJTC1/SC1.

The following cross-references are used in thisglossary:

Contrast with: This refers to a term that has anopposed or substantively different meaning.

Synonym for: This indicates that the term has thesame meaning as a preferred term, which was definedin its correct place in the glossary.

Synonymous with: This is a backward reference froma defined term to all other terms that have the samemeaning.

See: This refers the reader to multiple-word terms thathave the same last word.

See also: This refers the reader to related terms thathave a related, but not synonymous, meaning.

Deprecated term for: This indicates that the termshould not be used. It refers to a preferred term, whichis defined in its proper place in the glossary.

Copyright IBM Corp. 1996 X-1

Aac. Alternating current.

adapter . In a communicating device, a circuit cardthat, with its associated software and/or microcode,enables the device to communicate over the network.

address . (1) A name, label, or number identifying alocation in storage, a device in a system or network, orany other data source. (2) In data communication, theunique code assigned to each device or workstationconnected to a network.

Address Resolution Protocol (ARP) . A protocol thatdynamically maps between Internet addresses,baseband adapter addresses, X.25 addresses, andtoken-ring adapter addresses on a local area network.

AIX. Advanced Interactive Executive. See AIXoperating system.

AIX operating system . IBM’s implementation of theUNIX operating system. The RISC System/6000system, among others, runs the AIX operating system.

ANSI. American National Standards Institute

ARP. Address Resolution Protocol.

ATM. asynchronous transfer mode

attach . To make a device a part of a network logically.

Note:

Not to be confused with connect, which impliesphysically connecting a device to a network.

attachment unit interface (AUI) . In a local areanetwork, the interface between the medium attachmentunit and the data terminal equipment within a datastation. (I) (A) See also transceiver cable.

Bbalun . A transformer used to connect balanced cables,such as twisted-pair cables, to unbalanced cables, suchas coaxial cables, by matching the electricalcharacteristics of the cables.

bandwidth . (1) The difference, expressed in hertz,between the highest and the lowest frequencies of arange of frequencies. For example, analogtransmission by recognizable voice telephone requires abandwidth of about 3000 hertz (3 kHz). (2) Thebandwidth of an optical link designates theinformation-carrying capacity of the link and is related tothe maximum bit rate that a fiber link can support.

baud . (1) A unit of signaling speed equal to thenumber of discrete conditions or signal events persecond; for example, one baud equals one-half dotcycle per second in Morse code, one bit per second ina train of binary signals, and one 3-bit value per secondin a train of signals each of which can assume one ofeight different states. (A) (2) In asynchronoustransmission, the unit of modulation rate correspondingto one unit interval per second; that is, if the duration ofthe unit interval is 20 milliseconds, the modulation rateis 50 baud. (A)

bootstrap . (1) A sequence of instructions whoseexecution causes additional instructions to be loadedand executed until the complete computer program is instorage. (T) (2) A technique or device designed to bringitself into a desired state by means of its own action, forexample, a machine routine whose first few instructionsare sufficient to bring the rest of itself into the computerfrom an input device. (A)

bridge . (1) An attaching device that connects two LANsegments to allow the transfer of information from oneLAN segment to the other. A bridge can connect theLAN segments directly by network adapters andsoftware in a single device, or it can connect networkadapters in two separate devices through software anduse of a telecommunications link between the twoadapters. (2) A functional unit that connects two LANsthat use the same logical link control (LLC) proceduresbut may use the same or different medium accesscontrol (MAC) procedures. (T)

Note: A bridge connects networks or systems of thesame or similar architectures, whereas agateway connects networks or systems ofdifferent architectures.

bridge ID . The bridge label combined with the adapteraddress of the adapter connecting the bridge to theLAN segment with the lowest LAN segment number; itis used by the automatic single-route broadcast functionin IBM bridge programs.

broadcast . (1) Transmission of the same data to alldestinations. (T) (2) Simultaneous transmission ofthe same data to more than one destination. (3) Apacket delivery system where a copy of a given packetis given to all hosts attached to the network. Broadcastcan be implemented in hardware (Ethernet, forexample) or software. Contrast with multicast.

BTU. British thermal unit

buffer . (1) A portion of storage used to hold input oroutput data temporarily. (2) A routine or storage usedto compensate for a difference in data rate or time ofoccurrence of events, when transferring data from onedevice to another. (A)

X-2 8271 Nways EN LAN Switch Planning and Installation Guide

CC. Celsius.

cable segment . A section of cable betweencomponents or devices on a network. A segment canconsist of a single patch cable, multiple patch cablesconnected together, or a combination of building cableand patch cables connected together. See LANsegment, ring segment.

cascade . To connect in a series or in a succession ofstages so that each stage derives from or acts upon theproduct of the preceding stage.

client . (1) A user. (2) A functional unit that receivesshared services from a server. (T)

collision . When a frame from a transmitting adapterencounters any other signal in its path (frame, noise, oranother type of signal), the adapter stops transmittingand a collision is registered.

community . An administrative relationship betweenSimple Network Management Protocol (SNMP) entities.

community name . An opaque string of octetsidentifying a community.

configuration . (1) The manner in which the hardwareand software of an information processing system areorganized and interconnected. (T) (2) The devicesand programs that make up a system, subsystem, ornetwork. (3) The task of defining the hardware andsoftware characteristics of a system or subsystem.

configuration management . The monitoring andcontrol of information required to identify physical andlogical network resources, their states, and theirinterdependencies. Services include customization,network resource inventory, and assistance to othernetwork management disciplines.

configuration parameters . Variables in aconfiguration definition, the values of which characterizethe relationship of a product, such as a bridge, to otherproducts in the same network.

congestion . See network congestion.

connect . In a LAN, to physically join a cable from astation to an access unit or network connection point.Contrast with attach.

connectivity . (1) The capability of a system or deviceto be attached to other systems or devices withoutmodification. (T) (2) The capability to attach a variety offunctional units without modifying them.

connector . A means of establishing electrical flow.

contention . In a LAN, a situation in which two or moredata stations are allowed by the protocol to starttransmitting concurrently and thus risk collision. (T)

DDAS. (1) data access system (2) dual attachingsystem (FDDI)

data terminal equipment (DTE) . (1) That part of adata station that serves as a data source, data sink, orboth. (I) (A) (2) Equipment that sends or receives data,or both.

dB . Decibel.

decibel (dB) . (1) One tenth of a bel. (2) A unit thatexpresses the ratio of two power levels on a logarithmicscale. (3) A unit for measuring relative power. Thenumber of decibels is 10 times the logarithm (base 10)of the ratio of the measured power levels; if themeasured levels are voltages (across the same or equalresistance), the number of decibels is 20 times the logof the ratio.

default . Pertaining to an attribute, value, or option thatis assumed when none is explicitly specified. (I)

default value . (1) A value assumed when no valuehas been specified. (2) A value that is automaticallysupplied or assumed by the CallPath for Workstationssubsystem and the program, or the switch and theprogram, when no value is supplied by the program.

destination . Any point or location, such as a node,station, or particular terminal, to which information is tobe sent.

destination address . A field in the medium accesscontrol (MAC) frame that identifies the physical locationto which information is to be sent. Contrast with sourceaddress.

device . (1) An input/output unit such as a terminal,display, or printer. See also attaching device. (2) Aphysical entity attached to the network that requiresdata transportation service. (3) An input/output (I/O)unit such as a terminal, display, printer, or telephone.

diagnostics . The process of investigating the cause orthe nature of a condition or problem in a product orsystem.

domain . (1) That part of a computer network in whichthe data processing resources are under commoncontrol. (T) (2) In the Internet, a part of a naminghierarchy in which the domain name consists of asequence of names (labels) separated by periods

Glossary X-3

(dots). (3) In OSI, an administrative partition of acomplex distributed system.

DRAM. dynamic random access memory

DTE. Data terminal equipment. (A)

duplex . Pertaining to communication in which data canbe sent and received at the same time. Synonymouswith full-duplex. Contrast with half-duplex.

EEEPROM. electrically erasable programmable readonly memory

EGA. enhanced graphics adapter

EIA/TIA . Electronic IndustriesAssoiciation/Telecommunications Industries Association.(USA)

EIA 232. In data communications, a specification ofthe Electronic Industries Association (EIA) that definesthe interface between data terminal equipment (DTE)and data circuit-terminating equipment (DCE), usingserial binary data interchange.

equipment rack . Synonym for rack.

establishment . A user’s premises that do not extendacross public rights of way (for example, a single officebuilding, warehouse, or campus).

Ethernet . (1) A 10-Mbps baseband local area networkthat allows multiple stations to access the transmissionmedium at will without prior coordination, avoidscontention by using carrier sense and deference, andresolves contention by collision detection andtransmission. Ethernet uses carrier sense multipleaccess with collision detection (CSMA/CD). (2) Apassive coaxial cable whose interconnections containdevices or components, or both, that are all active. Ituses CSMA/CD technology to provide a best-effortdelivery system.

execute . To perform the actions specified by aprogram or a portion of a program. (T)

exit . To execute an instruction within a portion of acomputer program in order to terminate the execution ofthat portion. Such portions of computer programsinclude loops, subroutines, modules, and so on. (T)

FF. Fahrenheit.

faceplate . A wall-mounted or surface-mounted platefor connecting data and voice connectors to a cablingsystem.

FDDI. fiber distributed data interface (100 Mbit/s fiberoptic LAN)

filter . A device or program that separates data,signals, or material in accordance with specified criteria.(A)

frame . (1) A data structure that consists of fields,predetermined by a protocol, for the transmission ofuser data and control data. The composition of aframe, especially the number and types of fields, mayvary according to the type of protocol. (2) The unit oftransmission in some local area networks, including theIBM Token-Ring Network; it includes delimiters, controlcharacters, information, and checking characters. (3) Apacket that is transmitted over a serial line or LANs.See also packet.

ft³. foot cubed, feet cubed

full-duplex . Synonym for duplex.

Hhalf-duplex (HDX) . In data communication, pertainingto transmission in only one direction at a time. Contrastwith duplex.

HDX. Half-duplex.

hr . hour, hours

Hz. symbol for Hertz (ISO 1000 - derived unit,frequence in cycles per second

IIEEE. Institute of Electrical and Electronics Engineers.

Internet . The largest internet in the world consisting oflarge national backbone networks and a myriad ofregional and campus networks all over the world. TheInternet uses the Internet protocol suite. See alsointernet.

in . inch (2.540 centimeters)

Internet Protocol (IP) . (1) A protocol that routes datathrough a network or interconnected networks. IP actsas an interface between the higher logical layers andthe physical network. This protocol, however, does not


provide error recovery, flow control, or guarantee thereliability of the physical network. IP is aconnectionless protocol. (2) A protocol used to routedata from its source to its destination in an Internetenvironment.

IP. Internet Protocol.

IP address . A 32-bit address assigned to devices orhosts in an IP internet that maps to a physical address.The IP address is composed of a network and hostportion.

KKcal . kilocalorie

Kva . kilovolt-amperes

LLAN . Local area network.

LAN segment . (1) Any portion of a LAN (for example,a single bus or ring) that can operate independently butis connected to other parts of the establishment networkvia bridges. (2) An entire ring or bus network withoutbridges. See cable segment, ring segment.

lb . Pound.

LED. Light-emitting diode.

light-emitting diode (LED) . A semiconductor chip thatgives off visible or infrared light when activated.

link . The logical connection between nodes includingthe end-to-end link control procedures.

local area network (LAN) . (1) Physical networktechnology that transfers data at high speed over shortdistances. (2) A network in which a set of devices areconnected to one another for communication and thatcan be connected to a larger network. See alsoEthernet. (3) A computer network located on a user’spremises within a limited geographical area.Communication within a local area network is notsubject to external regulations; however, communicationacross the LAN boundary may be subject to some formof regulation. (T)

Mm³. meter cubed, meters cubed

ma. milliampere

MAC. Medium access control.

management information base (MIB) . A collection ofobjects that can be accessed by means of a networkmanagement protocol.

MB. (1) For processor storage and real and virtualmemory, 1048 576 bytes. (2) For disk storage capacityand transmission rates, 1 000 000 bytes.

Mb. Megabit.

Mbps . One million bits per second.

MDI. media dependent interface

MDI-X. media dependent interface crossed

MIB. (1) Management information base. (2) MIBmodule.

min . minute, minutes

mm . Millimeter, millimeters.

modem (modulator/demodulator) . (1) A functionalunit that modulates and demodulates signals. One ofthe functions of a modem is to enable digital data to betransmitted over analog transmission facilities. (T) (A)(2) A device that converts digital data from a computerto an analog signal that can be transmitted in atelecommunication line, and converts the analog signalreceived to data for the computer.

multicast . (1) Transmission of the same data to aselected group of destinations. (T) (2) A special form ofbroadcast where copies of the packet are delivered toonly a subset of all possible destinations. Contrast withbroadcast.

NNetView . A host-based IBM licensed program thatprovides communication network management (CNM)or communications and systems management (C&SM)services.

network administrator . A person who manages theuse and maintenance of a network.

network congestion . An undesirable overloadcondition caused by traffic in excess of what a networkcan handle.

network management . The process of planning,organizing, and controlling a communications-orientedsystem.

node . (1) In a network, a point at which one or morefunctional units connect channels or data circuits. (I)(2) In network topology, the point at an end of abranch. (T) (3) The representation of a state or an

Glossary X-5

event by means of a point on a diagram. (A) (4) In atree structure, a point at which subordinate items ofdata originate. (A) (5) An endpoint of a link or ajunction common to two or more links in a network.Nodes can be processors, communication controllers,cluster controllers, or terminals. Nodes can vary inrouting and other functional capabilities.

NVRAM. non volatile random access memory

Oohm . A unit of electrical resistance equal to that of aconductor in which a current of one ampere is producedby a potential of one volt across its terminals.

Ppacket . (1) In data communication, a sequence ofbinary digits, including data and control signals, that istransmitted and switched as a composite whole. (I)Contrast with frame.

packet internet groper (PING) . A program used inTCP/IP networks to test the ability to reach destinationsby sending the destinations an Internet ControlMessage Protocol (ICMP) echo request and waiting fora reply. The term, ping, is used as a verb.

panel . A formatted display of information that appearson a display screen.

parameter . (1) A variable that is given a constantvalue for a specified application and that may denotethe application. (I) (A) (2) An item in a menu or forwhich the user specifies a value or for which the systemprovides a value when the menu is interpreted.(3) Data passed between programs or procedures.

password . In computer security, a string of charactersknown to the computer system and a user, who mustspecify it to gain full or limited access to a system andto the data stored within it.

path . (1) In a network, any route between any twonodes. A path may include more than onebranch. (T) (2) The route traversed by theinformation exchanged between two attaching devicesin a network. (3) The series of transport networkcomponents (path control and data link control) that aretraversed by the information exchanged between twonetwork accessible units (NAUs). A path consists of avirtual route and its route extension, if any.

path cost . A value, maintained by each IBM bridgeprogram that uses the automatic single-route bridgefunction, that indicates to the automatic single-routebridge function the relative length of the path betweenthe root bridge and a designated or standby bridge.

personal computer (PC) . (1) A microcomputerprimarily intended for stand-alone use by an individual.(T) (2) A desk-top, floor-standing, or portablemicrocomputer that usually consists of a system unit, adisplay monitor, a keyboard, one or more diskettedrives, internal fixed-disk storage, and an optionalprinter. PCs are designed primarily to give independentcomputing power to a single user and are inexpensivelypriced for purchase by individuals or small businesses.

PING. packet internet groper

plug . (1) A connector designed to insert into areceptacle or socket. (2) To insert a connector into areceptacle or socket.

port . (1) An access point for data entry or exit. (2) Aconnector on a device to which cables for other devicessuch as display stations and printers are attached.(3) The representation of a physical connection to thelink hardware. A port is sometimes referred to as anadapter, however, there can be more than one port onan adapter. A single DLC process can control one ormore ports. (4) An abstraction used by transportprotocols to distinguish among multiple destinationswithin a host machine.

POST. Power-on self-test.

power-on self-test (POST) . A series of diagnostictests that are run automatically by a device when thepower is switched on.

primary path . The channel an operation first uses.

problem determination . The process of determiningthe source of a problem; for example, a programcomponent, a machine failure, telecommunicationfacilities, user or contractor-installed programs orequipment, an environment failure such as a powerloss, or user error.

Rrack inventory chart . An IBM Token-Ring Networkplanning chart indicating the location of the componentsinstalled in an equipment rack.

RAM. Random access memory. (A)

random access memory (RAM) . (1) A storage devicein which data can be written and read. (2) A storagedevice into which data is entered and from which datais retrieved in a nonsequential manner.

repeater . A device used to amplify or reshape signals.

reset . On a virtual circuit, re-initialization of data flowcontrol. At reset, all data in transit are eliminated.


ring segment . A ring segment is any section of a ringthat can be isolated (by unplugging connectors) fromthe rest of the ring. A segment can consist of a singlelobe, the cable between access units, or a combinationof cables, lobes, and/or access units. See cablesegment, LAN segment.

root . The bridge with the lowest numbered bridgeidentifier in the network. It is responsible for periodicallyinitiating configuration bridge protocol data units to otherbridges in the network.

SSAS. single attaching system

serial port . On personal computers, a port used toattach devices such as display devices, letter-qualityprinters, modems, plotters, and pointing devices suchas light pens and mice; it transmits data 1 bit at a time.

session . (1) In network architecture, for the purposeof data communication between functional units, all theactivities which take place during the establishment,maintenance, and release of the connection. (T)(2) A logical connection between two networkaccessible units (NAUs) that can be activated, tailoredto provide various protocols, and deactivated, asrequested. Each session is uniquely identified in atransmission header (TH) accompanying anytransmissions exchanged during the session. (3) Theperiod of time during which a user of a terminal cancommunicate with an interactive system, usually,elapsed time between logon and logoff.

Simple Network Management Protocol (SNMP) .(1) An IP network management protocol that is used tomonitor routers and attached networks. (2) ATCP/IP-based protocol for exchanging networkmanagement information and outlining the structure forcommunications among network devices. SNMP is anapplication layer protocol. Information on devicesmanaged is defined and stored in the application’sManagement Information Base (MIB).

SNMP. Simple Network Management Protocol.

source address . A field in the medium access control(MAC) frame that identifies the location from whichinformation is sent. Contrast with destination address.

spanning tree . The method by which bridgesautomatically develop a routing table and update thattable in response to changing topography to ensure thatthere is only one route between any two LANs in thebridged LAN. This method prevents packet looping,where a packet returns in a circuitous route back to thesending router.

SQE. system queue element

star . A wiring arrangement in which an individual cableruns from each work area to a concentration point.

station . (1) An input or output point of a system thatuses telecommunication facilities; for example, one ormore systems, computers, terminals, devices, andassociated programs at a particular location that cansend or receive data over a telecommunication line.(2) A location in a device at which an operation isperformed; for example, a read station.

STP. shielded twisted pair (cable)

subnet mask . A bit template that identifies to theTCP/IP protocol code the bits of the host address thatare to be used for routing for specific subnets.

Ttelephone twisted pair . One or more twisted pairs ofcopper wire in the unshielded voice-grade cablecommonly used to connect a telephone to its wall jack.Also referred to as unshielded twisted pair (UTP).

Telnet . In TCP/IP, an application protocol that allows auser at one site to access a remote system as if theuser’s display station were locally attached. Telnetuses the Transmission Control Protocol as theunderlying protocol.

TFTP. Trivial File Transfer Protocol.

threshold . (1) A level, point, or value above whichsomething is true or will take place and below which itis not true or will not take place. (2) In IBM bridgeprograms, a value set for the maximum number offrames that are not forwarded across a bridge due toerrors, before a threshold exceeded occurrence iscounted and indicated to network managementprograms. (3) An initial value from which a counter isdecremented to zero, or a value to which a counter isincremented or decremented from an initial value.When the counter reaches zero or the threshold value,a decision is made and/or an event occurs.

time-out . (1) An event that occurs at the end of apredetermined period of time that began at theoccurrence of another specified event. (I) (2) A timeinterval allotted for certain operations to occur: forexample, response to polling or addressing beforesystem operation is interrupted and restarted. (3) Aparameter related to an enforced event designed tooccur at the conclusion of a predetermined elapsedtime. A time-out condition can be canceled by thereceipt of an appropriate time-out cancellation signal.

topology . The physical or logical arrangement ofnodes in a computer network. Examples are ringtopology and bus topology.

Glossary X-7

transceiver . A physical device that connects a hostinterface to a local area network, such as Ethernet.Ethernet transceivers contain electronics that applysignals to the cable and sense collisions.

transceiver cable . In communications, the cable andits connectors that connects the input/output adapter tothe transceiver.

transmit . To send information from one place forreception elsewhere. (A)

transparent bridging . A method for tying individuallocal area networks (LANs) together through themedium access control (MAC) level. A transparentbridge keeps the tables that hold MAC addresses sothat frames seen by the bridge can be forwarded toanother LAN if the tables indicate to do so.

trap . A vital part of the Simple Network ManagementProtocol (SNMP). A trap is specified data that is sentby a managed node (agent function) to a managementstation to report an exception condition.

tree . A physical topology consisting of a hierarchy ofmaster-slave connections between a concentrator andother FDDI nodes (including subordinate concentrators).

tree network . A network in which there is exactly onepath between any two nodes. (T)

Trivial File Transfer Protocol (TFTP) . In the Internetsuite of protocols, a protocol for file transfer thatrequires minimal overhead and minimal capability.TFTP uses the connectionless datagram deliveryservices of the User Datagram Protocol (UDP), whichallows hosts that have no disk storage to implementTFTP in read-only memory (ROM) and use it to bootthemselves.

twisted pair . A transmission medium that consists oftwo insulated electrical conductors twisted together toreduce noise. (T)

UUDP. user datagram protocol

UFC. Universal Feature Card

UTP. unshielded twisted pair (cable)

Universal Feature Card (UFC) . An adapter that canbe installed in the Universal Feature Slot of the 8271Nways LAN Switch to provide additional connections.

unshielded twisted pair (UTP) . See telephone twistedpair.

VV. Volt.

V ac. Volts alternating current.

VGA. virtual graphics adapter

Wwiring closet . A room that contains one or moredistribution panels and equipment racks that are used tointerconnect cables. Sometimes called a network wiringcloset to distinguish it from a telephone wiring closet.

workstation . (1) A functional unit at which a userworks. A workstation often has some processingcapability. (T)


Index

Aadaptive mode 1-2Address Aging Menu 4-43Address Tables Menu 5-5AUI cables

description 2-2pinout 2-2

AUI port 1-5AUI 1-5

AUI port cabling 3-7AUI port, IBM 8271 2-2

Bbaud rate for console connection 4-4BootP procedure 7-4broadcast suppression 4-49

Ccable management bracket, installing 3-3cable pin-outs B-1cable wiring B-1cables

AUI 2-2crossover 2-2IBM Cabling System 2-1STP 2-1straight-through 2-2UTP 2-1

cabling10BASE-Fn connections 3-710BASE-T connections 3-510BASE2 connections 3-710BASE5 connections 3-7an IBM 8271 3-5AUI connections 3-7building wiring 3-5, 3-6chart 3-3guidelines 3-5labeling cables 3-6, 3-7types 3-5

cabling chart, instructions for completing 2-5capacity of the 8271 1-8cascading 8271s 2-2charts, filling out

8271 cabling chart 2-58271 configuration parameters worksheet 2-7locator charts 2-7rack inventory chart 2-5service information card 2-6

code upgrades 1-9cold boot 4-55Community Strings Panel 4-20configuration parameters worksheet, instructions for

completing 2-7Configure Filters Panel 4-38Configure Port Security Mode Panel 4-40configuring 4-3

Address Aging 4-43console session 4-52domain IP parameters 4-17domain ports 4-13domains 4-12EtherPipes 4-34EtherProbe 4-33MAC address filters 4-37MAC filters 4-38master address table aging 4-46password 4-51port address table aging 4-44port path cost 4-26port priority 4-24port security 4-40ports 4-30SNMP 4-19spanning tree 4-22Telnet sessions 4-54using SNMP-based manager 4-3

Configuring the 8271 4-1configuring the 8271 using SNMP 4-3configuring the 8271, changing parameters 4-7connecting LAN segments to the 8271 1-8connecting to end-node devices 3-5connecting to hubs 3-5console

communication settings 4-4connecting 4-4starting a session 4-6

Console Configuration Menu 4-52Copyright Panel 4-6crossover cable 3-5crossover cables

description 2-2Current Spanning Tree Information 4-28, 5-10cut-through mode 1-2

Ddedicated media 1-8default gateway 4-1default settings of the 8271 4-1—4-2

Copyright IBM Corp. 1996 X-9

diagnostic messages 3-9, 4-57dimensions of the 8271 1-7Domain Address Table 5-7domains 4-12

configuring 4-12Current Spanning Tree Information Panel 4-28IP parameters, configuring 4-17naming 4-15ports, configuring 4-13spanning tree, configuring 4-22statistics, viewing 5-12

downloading softwareBootP 7-4serial port 7-1system request menu 7-3TFTP 7-1

EEIA 232 port 1-9, 2-7, 4-1EtherPipe Configuration Panel 4-35EtherPipe Menu 4-34EtherPipes 1-3EtherProbe 4-33

Probe 4-33EtherProbe Configuration Panel 4-33EtherProbe port 1-5

Ffeatures

IBM 8271 1-2features, product 1-2filters 4-37

MAC address 4-37forward delay 4-2

IIBM Cabling System 2-1IEEE 802.3 Statistics Panel 5-13installation instructions, summary 3-1interconnecting 8271s 2-2introduction to the 8271 1-1IP Configuration panel 4-17

L label

MAC address 2-7serial number 2-7voltage 2-7

LAN segmentsdedicated media 1-8shared media 1-8

LEDs 3-8during diagnostics 3-8

LEDs (continued)port 1-6, 1-7, 6-2status 1-6, 6-2

locator chartsinstructions for completing the 2-7

MMAC address 1-2, 2-7, 5-6, 5-7, 5-8MAC Filter & Port Security Menu 4-37Main Menu 4-6management via 1-9managing the 8271

using the SNMP management agent 1-9via the EIA 232 port 1-9

Master Address Table 5-6Master Address Table Aging Panel 4-46MDI (medium-dependent interface) 1-5MDI-X (medium-dependent interface crossed) 1-5menu 4-8

Configuration 4-8Configure Filters Menu 4-38EtherPipe menu 4-34SNMP Configuration 4-19Spanning Tree Menu 4-22Telnet Configuration 4-54Virtual Switch Configuration 4-12Virtual Switch Port Configuration 4-13

messages, diagnostic 3-9MIBs (management information bases) 4-3

standard 4-3Microcode level 4-10modem, connecting 4-5Module Information Panel 4-32monitoring panels

address tables menu 5-5domain address table 5-7IEEE 802.3 statistics panel 5-13master address table 5-6port address table 5-8port n statistics panel 5-4spanning tree bridge information 5-9statistics panel 5-1switch statistics panel 5-2virtual switch statistics panel 5-12

monitoring the 8271 5-1mounting the 8271

rack mounting 3-3surface placement 3-4

multiple 8271s 2-2

Nnetwork management 4-3network management station 4-3


non-volatile RAM 4-57

Ooperating environment, 8271 1-8

PPanel 4-6

Copyright 4-6Current Spanning Tree Information Panel 4-28,

5-10EtherPipe Information Panel 4-36IP Configuration Panel 4-17Master Address Table Aging 4-46Port Address Table Aging 4-44Port Configuration Panel 4-30Port Filters 4-42Port N Statistics Panel 5-2Port Path Cost Panel 4-26Port Priority Panel 4-24Spanning Tree Bridge Information 5-9Switch Information 4-10Telnet Sessions Panel 4-55Virtual Switch Domain Selection Panel 4-16Virtual Switch Name Configuration 4-15

parts listing 6-6Password Panel 4-51password, default 4-6physical dimensions of the 8271 1-7physical dimensions, 8271 1-7planning

cables 2-1changing 2-6configuration 2-6distances between devices 2-1management 2-6physical 2-1spanning tree parameters, and 2-6

planning charts A-1—A-21Port Address Table 5-8Port Address Table Aging Panel 4-44Port Configuration Panel 4-30Port N Statistics Panel 5-4Port Path Cost Panel 4-26Port Priority Panel 4-24Port Switching Mode Panel 4-47

config.port switching mode 4-47Ports 1-5

address table aging 4-44address table, viewing 5-5broadcast suppression 4-49configuration 4-30filters, viewing 4-42MDI or MDI-X 1-5, 2-6path cost 4-26

Ports (continued)security mode, configuring 4-40spanning tree, current 5-10statistics panel 5-2switching mode, setting 4-47

ports, IBM 8271AUI 2-2management 1-9, 2-7

power requirements, 8271 1-7powering on the 8271 3-8

Rrack inventory chart

instructions for completing the 2-5rack-mounting instructions 3-3RAM, non-volatile 4-57remote terminal access 4-5reset button 1-6Reset Menu 4-56resetting the 8271 4-55Running EtherPipe Information Panel 4-36Runt-Free Switching 1-2

Ssample applications 2-4saving changes 4-7security, port 4-40Serial Link Configuration Panel 4-53service information card, instructions for

completing 2-6service, obtaining 6-1shared media 1-8simple network management protocol (SNMP)

See SNMP (simple network management protocol)sketching your network 2-1SNMP (simple network management protocol) 4-3SNMP Configuration Menu 4-19spanning tree 4-22

bridge information 5-9configuring 4-22Current Information Panel 4-28port path cost, setting 4-26port priority, setting 4-24

spanning tree algorithm 2-2Spanning Tree Bridge Information 5-9Spanning Tree Menu 4-22statistics 5-2

IEEE 802.3 5-13switch, viewing 5-2Virtual Switch, viewing 5-12

Statistics Menu 5-1statistics, viewing 5-1store-and-forward mode 1-2

Index X-11

STP cables 2-1straight-through cable 3-5straight-through cables

description 2-2surface-mounting instructions 3-4switch 4-1

priority 4-1Switch Information Panel 4-10Switch Statistics Panel 5-2switching modes 1-2switching techniques used by the 8271 1-8system ID 4-10system request button 1-6System Request Menu 7-3

TTelnet Configuration Panel 4-54Telnet Sessions Panel 4-55testing the 8271 3-8TFTP, downloading 7-1tools 3-2Trap Receivers Panel 4-21troubleshooting 8271 problems 6-1

UUFC (universal feature card)

configuring 4-2installing 3-2types of 1-6

unpacking instructions 3-1UTP cables 2-1

Vverifying operation of the 8271 3-8View Port Filters Panel 4-42viewing 8271 statistics 5-1virtual switch 1-2, 4-13Virtual Switch Configuration menu 4-12

Domain Selection Panel 4-16 Name Configuration panel 4-15 Port Configuration Menu 4-13Statistics Panel 5-12

Wwarm boot 4-55worksheets, filling out

8271 cabling chart 2-58271 configuration parameters worksheet 2-7locator charts 2-7rack inventory chart 2-5service information card 2-6

XXmodem protocol for code upgrades 1-9


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